This is a place to store shinies until its time to vote on em. Enjoy.
The important part here is the palettes, not the sprite itself. So don't freak out if someone posts an outdated sprite.
Back sprites are not needed as long as they share a palette.
Referencing GF colors and palettes may help: http://bulbapedia.bulbagarden.net/wiki/List_of_Pok%C3%A9mon_by_color