There really is no end to what you can do with USB power. While these old USB-powered Christmas trees annoyed your office mates with relentless Christmas carols, this USB-powered string of lights is a classier hand-made (it uses Legos!) decoration, available just in time for the office holiday party. The $15 lights are LED, so will last for years— if annoying your co-workers really is your goal, you can keep them on year round.

Via Etsy