Pretty simple choices, Have you ever painted your army Pink? Whether on Tabletop or in a Videogame, it doesn't matter, it's the same thing.
What about the Emperor's Children? Being a perverted version of the 80's Glamrock bands would allow you to wear pink and not look to ridiculous ( or at least not more ridiculous than you already look anyway).
I'm guessing this is to satisfy your "Only picks a chapter based on color" or something along those lines, with something about true 40k players not being here yet.
Why my reply function is fucked... a little annoying to be honest. @ fireeye There is no such thing as full pink in the 41st millenium. Period. Pink is for heretic anyway : deviant worshipping, gay colours... you get the point
Quite surprised that a mod hasn't at least edited the post above this one. Pink is all those things, eh? Anyhow, my Sisters army has a bright pink Exorcist tank and bright pink Avenger Strike Fighter. The Sister Hospitaller is also dressed in pink and white and the Canonness has pink hair.
Not a whole army, but I bought a plastic chaos terminator lord to paint for kicks and giggles, and he was pink and black -- I think I sold it too