I'll try to list as many pride colors as I can think of.
Gay Pride (Rainbow - Gay, Gay Men, Lesbians, and sometimes the entire Queer community. The rainbow represents acceptance of all sexual orientations.)
Labrys Lesbian Pride (Purple with Labrys in inverted black triangle [different versions exist] - Lesbians, women, and feminism, and gynephilic people who identify as female. Labrys became a symbol of lesbians and feminists due to the popularity of a female empowerment publication called Labrys Magazine. In addition, the black triangle is a symbol of lesbians due to the fact that many lesbians were forced to wear it in concentration camps during the Holocaust under the idea that they were "asocial" and did not conform to heteronormativity).
Bisexual Pride (Pink, Purple, and Blue - Bisexuals and sometimes all multisexual/non-monosexual/multiple gender attracted people.)
Pansexual Pride (Pink, yellow, blue - Pansexual. The pink and blue represent the gender binary of male and female attraction while yellow represents attraction beyond the binary. Yellow was also chosen because it represents life and happiness. The color yellow is also rarely used in pride flags, with the exception of those that include rainbows. The pansexual flag was based on the pink, purple, and blue bisexual flag, but the yellow stripe gives the pansexual flag its own unique identity.)
Polysexual Pride (Pink, green, and blue - Polysexual. Based on bisexual colors.. Pink represents attraction to females. Blue represents attraction to males. Green most likely represents attraction to people with non-binary gender identities.)
Transgender and Transsexual Pride (Light blue stripe, pink stripe, white stripe, pink stripe, blue stripe - Transgender people and transsexuals. Also sometimes for all genderqueer, intersex, drag, and all gender non-conforming identified people. Although, it is important to note that genderqueer and intersex people have their own respective flags as well. This flag was created by a trans woman named Monica Helms who says: "The stripes at the top and bottom are light blue, the traditional color for baby boys. The stripes next to them are pink, the traditional color for baby girls. The stripe in the middle is white, for those who are intersex, transitioning or consider themselves having a neutral or undefined gender. The pattern is such that no matter which way you fly it, it is always correct, signifying us finding correctness in our lives.")
Skoliosexual Pride (Yellow, green, white, and black horizontal lines with a lavender outline of a heart in the middle - Yellow represents being non-binary or attracted to non-binary people. Green represents bigender, third gender, genderqueer, or other genders. White and black represent neutral genderlessness, agender, questioning gender identity, etc. The outline of the lavender heart represents love outside the gender norms. I created this flag, but nedle is the one who invented the word. Also, ceterosexual is another word for skoliosexual.)
Two-Spirit (Rainbow flag with a Native American symbol in the middle - Two-Spirit identified people. The rainbow represents the LGBT spectrum, and the Native American symbol represents the cultural origin of Two Spirit.)
Genderqueer Pride (Lavender, white, and dark green - Genderqueer Pride. Lavender is a mixture of blue and pink and represents genderqueer people who identify as both male and female. The white stripe represents genderqueer people who fall outside of the female-male binary. Dark green represents the inverse of lavender for those who do not identify as female nor male).
Feather Pride Flag (A gold phoenix in front of red triangles and a black and white triangle pattern - Drag pride, drag queen pride, drag king pride, pride for those attracted to people in drag, and other fetishes. The phoenix is a symbol of rebirth while the red triangles represent the passion that the drag community had during the early days of the AIDS epidemic. NOTE: The Feather Pride flag has nothing to do with fetishes concerning feathers or birds. The name comes strictly from the phoenix symbol and only represents the drag community, people attracted to people in drag, and similar sexual orientations and gender identities.)
Androgynous Pride (Gray flag with an equal sign in which the top part is blue and the bottom is pink - Androgyny. The gray part of the flag represents the gray area between genders. The equal sign represents the equality between men and women.)
Bigender Pride (Lavender, white, light blue, pink, white, lavender - Bigendered people. The outer lavender stripes represent different mixtures of female and male characteristics, and the blue and pink stripes represent the presence of male and female mixed identities, and the white stands for sexuality and transitioning. NOTE: Early I had said that it is the Intersex and Bigender flag, but it is actually only representativ of Bigenderness. Intersexuality has sometimes been incorrectly and inappropriately attached to other flags even though there is an official Intersex flag).
Intersex Pride (Purple circle against a yellow background - Intersexuality. Yellow represents neutrality in gender instead of associating masculinity with blue and femininity with pink. It is also the main color of the Hermaphrodite Flag. The circle symbolizes wholeness).
Trigender Pride (Pink stripe, blue stripe, green stripe, blue stripe, and pink stripe - Trigender and possibly Third Gender. This is not an official flag but is a proposed or potential flag. The meaning of the colors are unknown, though it is very likely that pink represents the female aspect of gender, blue for male, and green for third or other gender.)
Hermaphrodite Flag (Stripes in shades of orange, yellow, and green with purple Venus' hand mirror / female symbol and Mars' shield / male symbol joined together in the center - Hermaphrodite Pride. Yellow represents neutrality in gender instead of associating masculinity with blue and femininity with pink. The flag is based on the Gay Pride flag in the sense of having a spectrum of hues that represent a fluid spectrum of gender. Venus and Mars symbols represent the unity of female and male characteristics and genitalia, with purple symbolizing the mixture of pink and blue as feminine and male colors. NOTE: Hermaphrodite should not be confused with intersex. The word "intersex" is an umbrella term for people born with androgynous or ambiguous genitalia. Hermaphrodites are a specific type of intersexuality in which a person has both sets of female and male genitalia. Hermaphrodites are considered part of the intersex spectrum; ironically, "hermaphrodite" used to be the accepted term for all intersexuality until intersex activists intervened.)
Genderfluid Pride (Pink, white, purple, black, blue - Genderfluid. Pink represents femininity. White represents all genders. Purple represents masculinity and femininity. Black represents genderlessness. Blue stands for masculinity.)
Nonbinary Pride (Horizontal stripes. From Top to Bottom: yellow, white, purple, and black - According to Nonbinary.org it was invented by "Kye Rowan in 2014. Yellow is for gender without reference to the gender binary. White: those with many or all genders. Purple: a mix of female and male. Black: without gender.")
Demisexual Pride (A thick white stripe, thin purple stripe, and a thick gray stripe with a black triangle on the dominating the left side - Demisexuals. Again, the meaning of the colors is unknown, though it appears to be based on the Asexual Pride Flag. The thick white stripe might symbolize sexuality, agender, intersexuality, transitioning, genderlessness, or being outside the straight-gay and male-female binaries. The thin purple stripe might represent female and male relationships, and the gray stripe might stand for asexuality. Black triangle might stand for romantics who reject traditional romance, asexuality, agender or genderlessness.)
Autochorissexual Pride (A triangle pointing toward with horizontal stripes in the colors purple, white, grey, and black juxtaposed to two smaller triangles with horizontal stripes in the colors black, grey, white, and purple - Autochorissexuality. [Anthony Bogaert created the term and says that it is a sub-section of asexuality. It represents people who do not want to have sex with another person nor experience sexual attraction to others but still are aroused by observing sexual content that may include pornography, sexual fantasies, erotica, etc.] Hunterinabrowncoat created the flag. Purple, white, grey, and black are the colors of the asexual flag. The black stripe represents asexuality. The gray stripe represents grey area between sexual and asexual feelings. The white stripe represents sexuality. The purple stripe represents community. The inverted triangle represents the idea that autochorissexuals have an inverted perspective on sexuality; Hunterinabrowncoat says that asexuals are not attracted to others though some asexuals engage or desire to engage in sexual activities while autochorissexuals have sexual attraction but do not want to engage in sexual activities).
Greysexual Pride (Horizontal stripes [in order of top to bottom]: purple, grey, white, grey, and purple - Created by Shikku27316 as a proposed flag. "My original explanation was kinda dumb. The purple was asexuality, the white was allosexuality, and the grey was the region of "getting over" asexuality, and then "getting over" allosexuality to be asexual again, but that sounds pretty dumb, plus it's not the only definition of greysexual. So, the colours mean the same, but it's kinda symbolising the two coming together to make the grey area." - Shikku27316 [Of course, I don't think it was dumb. If you get the chance, say something nice about it to Shikku] )
Deminonbinary Pride (Seven horizontal stripes. From top to bottom: dark grey, grey, yellow, white, yellow, grey, dark grey. - I'm not sure who invented this flag or what the colors originally mean, but my guess is that dark grey and grey represent a "grey area" in gender identity, yellow may mean outside the gender binary, and white represents gender neutrality or genderlessness.)
Demifluid Pride (seven horizontal stripes. From top to bottom: dark grey, grey, rainbow spectrum, white, rainbow spectrum, grey, dark grey - I'm not sure who created this flag or what its design means, but my guess would be grey and dark grey as partiality or a rejection of a black -and-white cissexist gender binary, white as gender neutrality, and the rainbow spectrum as a representative of fluidity.)
Demiflux Pride (seven horizontal stripes. From top to bottom: dark grey, grey, pink, yellow, blue, grey, dark grey. - I'm not sure who created this flag or what its colors and design originally meant, but my guess is that grey and dark grey represent partial gender identification or perhaps a reference to the Ace spectrum, pink is female, male is blue, and yellow is non-binary gender. It is interesting that pink, yellow, and blue are the pansexual pride colors, but the definition of pansexuality is very different from demiflux.)
Endogender Pride (five horizontal stripes. From top to bottom: green, dark green, light green, dark green, green. - Created by nova-pride-flags and colors specifically designated to be more accessible for people with eye-strain and other sensory issues. In addition to issues about eye strain, green often symbolizes non-binary gender.)
Endoboy Pride (five horizontal stripes. From top to bottom: blue, grey, lavender, grey, blue. - "Colors represent the spectrum of identities. The Outer Blues represents Masculinity. The Light Lavender in the middle is a mix of Pink, Blue, and Grey to represent people who shift to partially feminine/masculinie/genderless/nonbinary feeling.")
Endogirl (five horizontal stripes. From top to bottom: pink, purple, lavender, purple, pink. - "Colors represent the spectrum of identities. The Outer Pinks represents Femininity. The Light Lavender in the middle is a mix of Pink, Blue, and Grey to represent people who shift to partially feminine/masculinie/genderless/nonbinary feeling." The lavender color stripes were not mentioned, but lavender often represents a mixture of male and female [being that it is a blue combined with pink]).
Genderplus Pride (three horizontal stripes from top to bottom: medium dark gray, grey, medium dark grey. In addition, there is a red plus sign in the middle of the center stripe. - This flag was created by a tumblr user named allofyouguysarefuckingannoying: who could not find an existing gender identity and created this term. The meaning of the colors are unknown, but the grey and dark grey might represent partial gender or partial genderlessness, and the red plus sign most likely represents positivity as in presence of gender).
Genderpositive Pride (five horizontal stripes with a red plus sign in the middle. From top to bottom: red, white, orange, white, and red. "There are no meanings for individual stripe colours. Rather the colours were chosen in order to reflect positivity, activity, and to “pop” out at the viewer and make it known they are present. Just like one’s gender would be if they were feeling G+.")
Gendernegative Pride (three horizontal stripes from top to bottom: medium dark gray, grey, medium dark grey. In addition, there is a dark blue subtraction sign in the middle of the center stripe. - This flag was created by a tumblr user named allofyouguysarefuckingannoying: who could not find an existing gender identity and created this term. "There are no meanings for individual stripe colours. Rather the colours were chosen to represent negativity, a sedentary state of being, mellowness. The colours were chosen to be overlooked and not really acknowledge that they exist, just like your gender would be if one were feeling G-." A variation of this flag is listed by here.)
Demiboy Pride (seven horizontal stripes, from top to bottom: dark grey, grey, cyan, white, cyan, grey, dark grey - Flag was created by a tumblr user with the screen name Transrants. According to Nonbinary.org's Demigender page, the colors mean: "Blue: male. White: agender or nonbinary gender. Grey: partial.")
Demigirl Pride (seven horizontal stripes, from top to bottom: dark grey, grey, light pink, white, light pink, grey, dark grey - Flag was created by a tumblr user with the screen name Transrants. According to Nonbinary.org's Demigender page, the colors mean: "Pink: female. White: agender or nonbinary gender. Grey: partial.")
Agender Pride (Black, grey, white, green, white, grey, black horizontal stripes, in that order from top to bottom. - According to The Gender Wiki's Pride Flag Page: "Both black and white represent the complete absence of gender. Grey represents being semi-genderless. Green represents nonbinary gender, because it is the inverse of purple." It was created by a tumblr user with the screen name transrants in 2014).
Neutrois Pride (White, green, and black horizontal lines - Neutrois [genderless, agender, neutral gender, etc.]. The white stripe stands for neutral, unidentified, or questioning gender. The green stripe represents non-binary gender. The black stripe represents agender, asexuality, or third-gender.)
Aromantic Pride (Green, yellow, orange, and black - Aromantic and lithromantic. According to the creators of the flag: "We designed the flag to be as inclusive as possible and we used fairly basic color symbolism. Green, (being the opposite, complimentary color to red, which usually represents romance), represents aromanticism. Yellow, like the yellow rose which represents friendship, stands for various forms of queerplatonic love. Orange, being red once removed toward yellow, represents lithromantics. And black represents romantics who choose to reject traditional romance.")
Polyamory Pride Flag - (Blue, red, and black with a gold lowercase pi from the Greek alphabet. Polyamory. Blue represents openness and honesty between all lovers involved in each relationship. Red represents love and passion. Black represents all people in open and consensual relationships who have to hide their relationships due to social discrimination. The golden pi represents the value placed on emotional attachments to others.)
Leather Pride - (Black stripe, blue stripe, black stripe, blue stripe, white stripe, blue stripe, black stripe, blue stripe, black stripe, and a red heart in the upper left corner - Leather subculture. Black and blue stripes represent "being black and blue," which sometimes occurs after a leather encounter. The vast majority of people in the leather subculture emphasize consent and safety during leather sexual activity.)
BDSM Pride (Black stripe, blue stripe, black stripe, blue stripe, white stripe, blue stripe, black stripe, blue stripe, black stripe, and the Quagmyr's BDSM emblem in red and white in the middle - BDSM subculture [Bondage and Discipline, Sadomasochism, and Domination and Submission]. Based on the Leather flag combined with Quagmyr's BDSM emblem.)
Lipstick Lesbian Pride - (Stripes of different shades of red, purple, and pink with a white stripe in the middle as well as a lipstick print in the upper left corner. - Lipstick / Femme / Feminine Lesbians and other feminine female identified people who are attracted to female identified people. The shades of red, purple, and pink represents traditionally female associated colors.)
Boi Pride (from right to left, top to bottom, diagonal stripes at a 45 degree angle Green stripe, black stripe, green stripe, black stripe, white stripe, black stripe, green stripe, black stripe, green stripe, and a red heart in the upper right corner - Boi or boy, with boi sometimes associated with butch lesbian or young gay man. Based on the Leather pride flag, the diagonal tilt represents the elevated status of the Sir over the submissive status of the boi or boy. The red heart is in the right corner to symbolize where a boi/boy's heart is, and the green color represents a boyish color, possibly denoting the "green" or inexperienced young man.)
The International Bear Brotherhood Pride Flag (Brown, orange, yellow, light beige, white, grey, and black with a bear paw print in black in the upper left corner - Bears [hairy gay men]. The colors represent the various skin tones and natural hair colors as a sign of equality and unity. In addition, hair color has a connection to the body hair of self-identified bears.)
Furry Pride (Canine) (A plain white flag with a gray dog pawprint in the middle - Furry pride specifically for dog/canine focused furries, but it can sometimes represent all furries, Anthro, Morph, and Yiffies in the community. This is one of many flags that represent the Furry community, and there doesn't seem to be a consensus on which is the "official" or widely accepted flag. The dog pawprint represents the canine type fandom and also can also represent furries in general. It is unknown what the colors of the flag represent.)
Furry Pride (Feline) (Light blue, pink, and light purple with a white cat pawprint in the middle - Furry pride specifically for cat/feline/kitten furries, but it can also sometimes represent all furries, Anthro, Morph, and Yiffies. The light blue represents males, pink represents females, and light purple represents transgender individuals. The white cat paw print represents felines and also equality for furries of all genders.)
Androphilia Pride (Black, gray, white, and green - Androphilia in people of all gender identities. The meaning of each color in the flag is unknown for certain, but it is possible to make an educated guess based on other pride flags. Black could stand for gender neutrality or rejection of the straight-gay binary and the female-male binary. Gray might stand for the gray area between genders, reflecting that many gender non-conforming people identify as androphilic. White may represent equality, intersexuality, transitioning or neutral gender, or the idea that attraction to males does not equate to femininity. Green might symbolize masculinity or attraction to males.)
Gynephilia Pride (Black, gray, white, and pink - Gynephilia in people of all gender identities. The flag is not an official flag, just a proposed one. It appears to be based on the Androphilia Pride Flag. It is uncertain what each color stands for, but based on the Androphilia Pride Flag and other flags, this is my educated guess. Black could stand for gender neutrality or rejection of the straight-gay binary and the female-male binary. Gray might stand for the gray area between genders, reflecting that many gender non-conforming people identify as gynephilic. White may represent equality, intersexuality, transitioning or neutral gender, or the idea that attraction to females does not necessarily a result of masculinity or femininity. And pink is probably a tribute to attraction to all female identified people.)
Victory Over AIDS flag - (Red, orange, yellow, green, blue, purple, and black stripes. Clearly based on the Gay Pride rainbow flag. Although it is based on the Gay Pride flag, it most likely does not only represent AIDS in the male gay community. A person of any sexual orientation and gender identity can contract HIV or AIDS. The extra black stripe probably represents death, but it is possible that it represents triumph over darkness).
Marriage Equality (A red background with a pink equals sign - For all those who support the right of people to marry whomever they choose, regardless of sexual orientation or gender identity. It is usually representative of the battle for same-sex marriage in the United States but can also represent equal marital rights internationally. The flag was originally a blue background with a yellow equals sign. It was created by the Human Rights Campaign, an organization that fights for LGBT rights. It became increasingly popular at the same time that the demand for equal marital rights sparked the nation, so the organization changed it to red and pink to represent love, passion, equality, and the queer community.)
Ally Pride (Inverted V-shaped Rainbow triangle against black and white stripes - Allies, who usually identify as straight and cisgender, supporting the LGBT community, though it can also include people of all sexual orientations and gender identities. The inverted rainbow V represents the A in Activism while the black stripes represent heterosexuality.)
Metrosexual Pride (Light gray stripe, dark gray stripe, black stripe, purple stripe, black stripe, dark gray stripe, light gray stripe with a picture of a metrosexual man in the upper left corner [the man might be Mark Thaler, creator of the flag] - Metrosexual. It is unclear what each color means. The creator Mark Thaler sells memorabilia with this flag on it.)
Heterosexual Pride (Black and white stripes - Heterosexual, usually cisgender, people. The black and white stripes represent attraction to the opposite sex. This is a very controversial flag because unlike the Ally Pride flag, which represents straight people and others who specifically support the LGBT community, the heterosexual flag is not necessarily an ally flag. Some heterosexual-identified people use the flag as a homophobic reaction to LGBT pride. Others may use the flag as an indicator of their sexual orientation, but even that motivation is very questionable to the idea of equality in the face of privilege.)