I am addicted to candle wax... I have been ever since I got blindfolded and restrained one time when my wife had some leftover candles... We haven't really purposefully used different colors, but it just kinda happens when there isn't any wax left in the one candle.
We don't take pictures afterwards, but we do take pictures of drips of candle wax on our bodies, and then send them to each other while we are away from each other for a week or two.