I've posted
in the past about solar powered oscillators, but a recent post over at
getlofi brings up the topic again. This is a solar powered Atari Punk Console built by Poperboy:
[youtube]http://www.youtube.com/watch?v=ml7zvSxDXZY[/youtube]
It's worth noting that
Futurlec has recently expanded their range of solar panels - in particular the 9V, 70 mA solar cell near the bottom. That would be enough to power most guitar pedals, even with lower light. Interesting stuff!
-Colin