I bought a little solar panel recently. It lies in my windowsill, with open window, sucking up the sun's rays.
At night it recharges my phone, which works very well. It came with lots of different plugs to charge different phones and even my Nintendo DS. I like that I can use the sun to charge things. It also has a separate attachment so it can charge batteries. I haven't tried that out yet.
I made this drawing while my hand hurt badly and cramped up a lot. Not the smartest thing I ever did.