This past summer I saw an exhibition where one of the artists used what looked like liquid light on common canvas and then projected an image. The works were very large (maybe 5' x7') and the image was very contrasty uneven, in and out of focus, etc.. She (I think it was a woman) proceeded to paint over the image and adhere things to the canvas. The photo was the central piece and all the additions were done to complement the photo. It was pretty cool and looked as if it would have been a ball to do.