Thanks,it's a smoke shot: The smoke from "Norwegian x-mas incent" but other incent sticks would do. The lightening setup is: A dark background (dark brown cutains) in a completely dark room, with a single flash directed almost directly against the camera (just make sure you don't see the flash.). The rainbow-colours come from the light changin direction because of the smoke. If you get it right very little PP will be neccesarry...
~Rune
