[quote name='ITDEFX']not to sound racist, but I never got use to the idea of a BLACK vulcan.[/quote]
Well, there are black Bajorans too. I can't recall if there are many more though. I think the fact that they are humanoids means that certain characteristics like hair, skin tone, number of fingers, or whatever may exist in other humanoids species. Remember the episode of TNG where a changeling looking creature told Picard, the Cadassian, Romulan, and Klingon that they all originate from the same thing.
Most races in Trek seem to have few if any variations (Ferengi for example), but there is some "human-like" diversity in others. I think it is more a limiation of trying to create diverse groups for so many aliens more than anything. The fact that all Ferengi are businessmen, all Klingons are warriors, and all Vulcan are pacifists is great for TV, but not realistic most of the time.