did this in my bathroom! i put some garbage bags on the wall and i had a problem with getting the backlight into the photo cause there was no room for it! cause my bathroom is small :D
i end up with this setup!
430ex trough softbox from left above the model and for backlight i bounced 430ex with homemade snoot from a reflector that was taped to a wall behind the model :) i must say that my bathroom looked quite spooky after this shot!