In my opinion, so far I have only seen three "true" bhut colors, chocolate, red, and yellow. The peach bhuts are wonderful for heat and taste, but not very "bhut-ish" really. The few white bhuts I have tasted so far had little heat and no bhut taste at all. I have seen some caramel colored bhuts around that look really neat, but I haven't tasted or grown any of them yet. There is also a purple bhut that has gone around in a few circles here, but I don't know if the breeders continued developing it or if they stopped, I seem to remember that it didn't have they best reviews.
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Its all up for interpretation.