There's an app that I use and love called dreamboard (phones and computers) my favorite feature is that it has you select all the colors you remember from your dream, and then it builds a color grid that reflects your dream color palette. So if you dream a lot of red, the red square gets larger.
That's pretty cool @drwatson, will have to check that out. Never thought about colors too much, as my mind is usually focused on the story, characters, etc. Have to try to notice that next time.
It's a great logging app. You write the summary down, mention what characters and locations were in it, whether it was a lucid dream. All kinds of interesting things to think about