I don't remember ever having any black-and-white dreams, or any dreams that have an overall color cast, though I can't say I haven't. Of course, I don't remember the colors of everything in my dreams, but I typically do remember the colors of objects that played important roles in the dream. But then again, color is already so important to me in the waking world. For some reason, I love colors, and I frequently pay attention to the colors of objects when there's no real reason to. So I'm not surprised that I usually remember the colors of important objects in dreams, too.