My favorite subject in school had always been art so I'm familiar with color theory. But although remember wishing for the 64 box of crayons, most of them probably would be left unused.
I used to have frequent nightmares and they only stopped when I didn't allow them to upset me. I remember learning of a theory that when a driven is given to you by God, it will be in color and if it's from the devil, otherwise known as deception himself, it will only be in black and white because he can't duplicate the light required to create color. I think there is merit in that, but whether this is valid or speculation, it helped me in the ability disregard nightmares and "cast down vain imaginations to the obedience of Christ, with the Word that He gave us that He has not given us a spirit of fear. So, as long as there is color, I don't have to worry, whatever it is, it's good because it's from God, though I do pay more attention to it, and all other ones can be dismissed as no worse than the spicy meatballs I had for dinner.
Oh, and my memory isn't all that good either, but for the utility of the internet search.
That's an interesting thought on the color of dreams. I don't have dreams very often but when I do they've always been in color. I was just half joking about the nightmare thing, but around half of the dreams I do have are nightmares. I'm quite used to them at this point and they haven't really bothered me since my lower teen years. Now I sometimes find myself mid nightmare thinking that it's less scary than some 80's horror movies which then makes me wake up and somewhat laugh at the dream. The only ones that irk me nowadays are demonic dreams, not because I find them scary, but because it always makes me wonder if I allowed it to happen through sin I'm unaware of.