Recently I tried my hand at double exposure. It's a technique rooted in the film days, when the film wouldn't advance and you'd get two exposures/images on the same frame. In many digital cameras, you can mimic this technique and layer two frames to get something like this - the layer of texture you shoot after your portrait will become visible where the dark parts of your portrait are. It takes some practice, but it's a super creative way to explore portraiture. Of course, there are photoshop hacks for double exposure, but the challenge of doing it in camera is part of the fun.
This is László, begrudgingly posing so that I could get my base image.