we post pokemon palette swaps here
be it complete recolors, inversions, color swaps between 2+ pokemon, models, sprites, official art, we do it all.

if you dont know how to recolor on gimp/paint/photoshop and want to help contribute or practice, heres a tutorial for ms paint and gimp https://imgur.com/a/amAiH
requests make the backbone of the thread, so please make as many as you want with as many pokemon you want.

gen 1-6 sprites (website): http://www.pokestadium.com/tools/sprites
gen 7 sprites (download): https://www.dropbox.com/s/8drn9oj9snbk3b9/smnov1816.zip?dl=0

if youre looking to contribute but don't have any ideas, try generating one randomly with http://randompokemon.com/