Heres a double exposure shot that I did with me DSLR. It was a 30 sec exposure and half way through it, I threw my shirt over the lens (to stop light from getting in. Granted it wasn't the best way to achieve this effect) and ran the camera over to a different angle of the same object, and continued the exposure for another 12-13 seconds. I think it came out pretty interesting.
I feel like theres a lot to learn in double exposures. Especially when I see stuff that one of my photography friends does, Maya M. Crazy good.
God, I need to get back into film.