@riley Huh... I grew up with a B&W TV (we didn't get our first color model until I was, hmm, 12-ish?) but never dreamed in B&W as far as I know.
Then again, I wasn't allowed to watch that much TV, so...
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@woozle It probably depends on how dominant a form of visual stimulus is in somebody's life, for the most part. But it's well established that many people used to describe black-and-white dreams, but the trend turned strongly down soon after colour TV sets became ubiquitous. Unfortunately, people didn't usually make a note of their dreams' colouredness before the invention of black-and-white cinema, so we don't have strong historic data to study.
@woozle FWIW, in my dreams, colour is usually sort-of-present, but for the most part, most of the time, not particularly salient. I suspect what happens is, the dreams develop downstream of the primary visual cortex, in brain pathways that usually deal with visual input that has already been processed and somewhat interpreted, and colour data is ordinarily only preserved to this stage if it's unusual or particularly interesting in some sense. But I'm pretty sure people have dreams in very different ways, and not all of them are even visual.