Dreams make for awesome ideas. I want to see a room where the painting is done by multiple colors of foot prints all across the ceiling and possibly down the walls as if someone was walking. Feet of all sizes too. I think this has epic potential.

Maybe you have this really crazy multicolored chandelier in the middle of a room, fairly high ceilings, and all of these multicolored foot paths steps away from the chandelier and slowly fade out as they would naturally from the paint running out.  Some would come down the walls just a bit, others only a few steps away from the chandelier, etc.