In Skullgirls on the PS3 and Xbox 360, you can unlock extra color palettes for characters to use in the game. Most of these are character specific, but one applies to all playable characters.
Unlock Seventh Color Palette – Complete Story mode with a character to unlock the seventh color palette just for that character
Unlock Eighth Color Palette – Complete Arcade mode with a character to unlock the seventh color palette just for that character
Unlock Ninth Color Palette – Complete 25 versus matches with a characters to unlock the ninth color palette just for that character
Unlock Tenth Color Palette – Go to Versus and select Local, and press Down, RB, Up, LB, Y, B (Xbox 360) or Down, R1, Up, L1, Square, X on PS3 to unlock the tenth color palette for all characters