Always colour, and I always have a lot of them. My husband can't remember his, which seems so strange to me - sleeping for me is like watching a series of very strange, sometimes boring, TV shows!
I like this question immensely. Finally somewhere to state openly that my dreams are the most colorful of colors you can fantasize of. They're the most myriads of shades, neon and fluorescent like those seen in the Firework song in Madagascar-3. Most often I can vividly remember the dreams but failure catches up with me when I try narrating it to someone!