I like the semi-realistic tones. That is, all one solid flesh-tone. My VixSkin Tex is one of my favorite toys ever. The ultra-realistic ones that have colored veins and differently-toned heads are a bit much.
The hurdle for us was using realistically shaped toys, after getting over that the color was not as big of a deal. Although we're Caucasian, the ones we get are darker colors - so I suppose there is still some fantasy element to it.
I, like most, prefer different-colored (but not black, because, seeing my girljuice on black is gag-inducing), but will take flesh-colored if that's my only choice. In flesh-tones, I prefer non-caucasian.
I'm okay with them, but darker colored toys do bother me a little bit. Something about cum on a really dark color just grosses me out! I feel bad about it, but we all have our preferences. Otherwise, I don't really care~