I've decided the default melting pot coloring is dirty blonde hair and black eyes. This is the coloring my son has and he's mixed Middle Eastern, Mongolian, Polish, Russian, general European mutt. He has a friend who's half Indonesian and half South Shore Irish: same coloring. He has a friend who is a mixture of South Shore Irish, Portuguese and African: same coloring. Admittedly both of them have older siblings who do not share this similarity, but it seems to me if you mix enough gene pools, eventually this is what you end up getting.