I made a solar oven this week. I found all kinds of plans at:http://solarcooking.org/plans/ I chose one that I could do quickly that I had all the materials already on hand for because I was ansy and wanted to start cooking for free. :) Aside from the egg below, I've cooked a frozen burrito and made some smores. I want to try bread and some other things, but the sourdough starter I'm making still has 2 more days of rotting on the counter before it's ready.
The solar cooker
An egg from Nightcrawler, straight out of the coop
In the solar cooker after a few minutes
After about 18 minutes, the egg is cooked!