Here's a weird take on renewable energy -- do you have pests? Specifically, houseflies?
Then you might be interested in this "carnivorous lamp," which appears to be designed to catch flies, feed on them and use energy generated through that to power LEDs.
Only problem is it looks like a tiny disco ball or something.
Flies and moths are naturally attracted to light. This lamp shade has holes based on the form of the pitcher plant enabling access for the insects but no escape. Eventually they expire and fall into the microbial fuel cell underneath. This generates the electricity to power a series of LEDs located at the bottom of the shade. These are activated when the house lights are turned off.