i read in a site that Matt Groening (creator of The Simpsons) decided to make The Simpsons yellow because it was different, bright and "it looks like there's something wrong with your television set." well that answers that!
Matt Groening has stated that he has always hated the Caucasian pink color given to human cartoon characters, such as on the Flintstones. Someone at the production studio for the original Tracey Ullman shorts (whose name Groening could not recall in the DVD commentary this answer is based on) suggested they make the characters yellow instead.
I think they are yellow just bcozit stands out and looks good...i mean imagine the simpsons like green or blue or red it wouldnt be the same would it???
Well, I think that yellow in general is a color that makes you happy, according to reasearch.
Apart from that, yellow is the closest color to human skin. If you were to color ppl one color (of the primary colors or the 12 normal colors) what would u have colored?
(honestly, I would have colored it orange) Most ppl will color ppl's skin as yellow. (this is true. when i was in kindergarten, everyone colored ppl yellow, except me, who colored them orange) lol
^^