that said, there are unlimited numbers of things that can be powered by usb. with the holidays coming up, why not christmas lights? i've added a switch to the original design to allow me to turn them on and off without unplugging the usb cable. The whole thing is mounted into an enclosure (altoids tin, of course), purely for aesthetics.
Step 1: Get your equipment
oh, i also use a small toggle switch and some solder and what not.