Yes. I know I dream in color because I've had a recurring dream since I was in child in which a red balloon plays a major role- and there's no speaking in this dream - so it's not like anyone says, 'that's a nice red balloon' or anything...I just realized THAT!

...interesting....
I also have had dreams that take place outside in which the grass is very vividly green.
I know I have sound in my dreams, because I have woken up humming songs that I've written in my dream - I've never written the music to a song in real life.
I've also written poems in my dreams- but I've never been able to remember them enough to write them down when I wake up...which has frustrated me because sometimes I wake up and think I know that what I'd written in my dream was better than anything I'd ever written in real life - that's probably why it's called a dream though.