You can also get a clock that runs on the blood of insects.
http://www.engadget.com/2009/06/29/carnivorous-clock-eats-bugs-counts-down-to-doomsday/
It has already been done. They have designed lamps that run on the blood of insects.
http://www.yankodesign.com/2009/02/17/hungry-robots-devour-domestic-pests/
You can also get a clock that runs on the blood of insects.
http://www.engadget.com/2009/06/29/carnivorous-clock-eats-bugs-counts-down-to-doomsday/