I know this is an old thread, but I'll throw my .02 cents worth in regarding wind power. I built a VAWT (vertical axis wind turbine) using a couple of roof vent turbines and a ceiling fan motor, just as a proof of concept. When the wind really blew I would get some serious voltage for charging. You could get 5 volts by spinning the setup by hand.
Granted, it may look silly on a TTT, but I am a firm believer of function over form. Heres the youtube link: