Not a basketball collector, so just going by what I can do a little research on. Looks like there are the base card (which are silver) white prizms (which are white) and white sparkle prizms (which look really cool, although they appear to only be available through the website and not in packs). I'm guessing the scans on the site are just dull as it is hard to get a good scan on white.
Looking at the white from the red, white, and blue prizms I would say that the white prizms are more of a "cream" color.
Always looking for baseball variation/error cards and anything Garrett Whitley or Ian Anderson