This cool project from Instructables user treyes4 (together with TreeHugger favorite ASCAS) shows you how to pull parts from a few different gadgets and electronics you're no longer using to make something new and useful, in this case, a solar-powered Bluetooth speaker.
This how-to is for the more experienced tinkerer, but shouldn't take too long to complete. Treyes4 says about the proejct:
"Here's a simple Bluetooth speaker that's made from hacking old gadgets and mashing them up together. It sounds exactly like the big Jambox but only smaller! It has a mic and command buttons too!
The homebrew jambox is equipped with two 5W neodymium drivers, a 2.5" passive radiator, three command buttons, handsfee mic feature and a 2250mAh lithium battery."