This article examines the actual, scientific differences between genders in how they look at color. Using surveys, they found favorite and least favorite colors across gender lines. They also did a study to find what sort of colors each gender preferred. I found this interesting because it actually provides scientific basis for gender color differentiation. That isn't to say that the whole blue = boy, pink = girl thing is accurate (results found that both genders tended to prefer blue overall), but it's interesting that there are concrete, experimental differences.