My girlfriend bought me a battery-powered desk waterfall with LED lights from Wal-Mart. It has a port for a 5V AC power adapter. So with all the old AC adaptors laying around the house and an extra USB wire (included with my DSL modem), I cut, connected, and duct-taped the wires. Then, plugged in the waterfall and I now have a USB powered waterfall on my desk. You can get the "LED illuminated rainfall fountain" from Wal-Mart for about $10.