Photo booth rental. Immediate prints and/or upload to facebook.
I am starting a company that rents photo booths for private venues (parties, weddings, etc.). The photo booths have 22" screens, backdrops, and can be used in the open for large group photos. They also allow the users to immediately print the photos and/or send them to their facebook or other media. I personally know people with buildings they rent out for private parties and weddings. It would not be hard to stay busy.