What can I use an old Ceiling fan motor for? What can I use an old ceiling fan motor for? ?

If you're crafty enough and willing to put forth the effort, you could use it for a bicycle hub generator/motor. It would be much like making a permanent magnet generator out of a car alternator such as those used in small, home wind turbines. The motor is thin enough and there should be a way to tie it in to the rest of the bike. I think the most work will be rewinding the stator and, second, putting magnets in the rotor.