Make a Solar-Powered Oven

I actually learned about this craft from an episode of "Curious George!"  :-)  George and The Man in the Yellow Hat made a lasagna this way during a blackout.  I thought it was a neat way to reuse a box, cook using just the energy from the sun, and do a neat little craft project.  How keen and green can ya get?!

All you need is a box (a pizza box is perfect, because you can't recycle those!), foil, plastic wrap, newspaper, and a knife.

Uberpest has a simple one and TheSietch has a more advanced one.  

You can also buy sun ovens, which are probably are a little more reliable, but not as fun as building your own!