http://www.petesqbsite.com/sections/tutorials/tuts/tsugumo/chapter5.htm

Cool article on pixel art, but essentially the basics of color theory and such. Interesting read if you find this stuff at all interesting. ha!

9gag:

How do colors affect purchases?

Studied this in school. Stare at the black cross and watch the green dot appear and then follow the pink dots, then appear to “eat them up.” Read about it here: http://en.wikipedia.org/wiki/Afterimage