When I was in school the only real lessons we got in color theory were "there are no bad color combinations," and then a big "have at it!"
This doesn't even begin to touch on the ways that colors interact. Ever wonder why there is a light purple but no dark yellow? Ever wonder what the real difference between whiteness and brightness is? Well trip on down to LivelyGrey, play some games, and learn some lessons. You'll be glad you did.