I like the album covers idea.
I also like space aliens.
Self portraits could be amusing too (paint, sketch, cgi etc).
Kung Fu theme.
Underwater theme.
Horse heads (still attached to the horse of course).
Photo of one of your hands (an open-handed image, you can leave out that thing you keep fiddling with).
Roadkill.
Datsun month (tee hee).
Spiders.
Rockets.
Picture of your sister (please include contact information and last known whereabouts, for... umm, administrative purposes).