I actually take images of things and put them up around the wall and in a room. I set a room aside. It might be colors, it might be animals, or energy and words. And I'll just leave it there, so it begins to work on my subconscious when I think about the character. Which gives me some latitude to be really flexible and spontaneous but within the context of the character and the world of the character without having to think about it. Or I'll look at something or read something and let it work on my subconscious mind.