3-inch USB Plasma Ball Light with Base
This is a great USB gadget - it's a small, three-inch version of the large plasma ball globes sold at novelty stores.  It is absolutely mesmerizing, interactive and fun to touch. It functions silently, and doesn't overheat even if left on overnight. It also has a handy on/off switch, which is much more convenient than the USB gadgets that have to be unplugged to make it turn off. Overall, a great gadget!