Dremel Etching

Mark Donadio showed me how he etched a picture onto stone. He uses hobbiest Mod Podge to glue a picture to a flat stone. After it dries thoroughly he can rub the paper away with a sponge. The picture is then on the surface. He then uses a Dremel with a pointed bit to etch the picture after which he can clean the transferred image off. I imagine this would be a good way of doing a bas relief with chisels, as well.