AppBot's Stuart Hall takes a look at the dominant colors used in app icons and garners some interesting results (and some interesting "charts"):
The Conformist— You like to follow the crowd, so go for blue or red.
I Like To Be Different— Maybe you can go green, not the most popular, but you still aren’t being too risqué.
The Rebel— You laugh at the conformists, scoff at those who think they are different. Go for pink or purple and wear it like you own it.
Needs to be seen to fully appreciate.