I usually dream in colour however, occasionaly I have dreamt in sepia which have been some of my most vivd and memorable dreams. When I did dream in sepia I remember noticing that a different atmosphere was creating in my surroundings
The weird thing about my dreams are that I don't usually remember if I dream in color or not :/ I know I do some of the time, at least; there are other times where my dreams might just be too dark or too intricate to remember any color.
I've had a lot of very surreal dreams; people where you couldn't hear them speak, but you know what they say, and where you can't see their faces, but know who they are. Often times, I don't remember any color in these dreams; just a feeling of detachment and isolation.
Colors. Vivid. My dreams tend to cause me to believe the events are quite real. I've often woken up quite disappointed or confused because I expect to still be in the midst of whatever has been happening. The vividness of my dreams often times causes intense emotion, displayed within where I wouldn't ever display them while awake. I also can wake with the memory of how something felt, texture-wise, or smelled during a dream.
I only remember two dreams specifically being in black and white. One was a particularly disturbing dream I had as a kid and another was one of those rare movie-themed dreams. Rare in the sense of I wasn't interacting in any way with the characters and felt a detachment from the events- a pure spectator. The scene changes were cool.
Most of the dreams I remember have color (resisting puns), but sometimes I can't say anything plays into my memory that registers a dream as color or black/white.
I think dreams really are your brain working things in backwards. It's strange what random things from your day can get cycled in sometimes- when other things are ignored. The worst dreams are ones about some real-life terrifying event that you'll have to go through at some point in your life. It happens in the dream and it's horrible but you survive... and you wake up and you realize you still haven't survived it yet.
I don't think I really like dreams as a whole. They disturb my emotional state a lot. Which is great when I'm floating on air after a great dream. But twice as awful when it's an unsound one.* And dreams tend to muddle my sense of memory (I've a hard enough time remembering things without confusing dreams for real-life chronology). The best sleep of all is when I just wake up from nREM, feeling fresh and remembering nothing except a brief roll-over in the middle of the night.
*Maybe it's natural to not need happiness explained, but disturbance/unhappiness must be dissected and obsessed-over.