URGENT! What would be an interesting psychological experiment?

You might want to write about the psychological effect of certain colors on people's behavior. Doctor's and hospitals's waiting rooms are oftened painted soft shades of green because it is thought that green is a very comforting color to people who are anxious. Is this true? Are there hospital and doctor's waiting rooms in your area that are green? You can probably find some basic research on the psychological effect of certain colors on people by looking on the Internet too.