The "Havaleena" cordless LED lights from Tayo Design Studio are marketed as a kind of quirky-cool lighting for outdoor parties, but personally, I think they look like sleeker versions of the glow sticks that are frequently associated with the raver scene. They're not cheap--$59 bucks a pop, or $149 for a set of three that you can arrange into a "bouquet"--but they look pretty darn awesome, and you can customize the colors by switching around a variety of vellum filters. Additionally, the filters can have a short line of text printed on them. For example, you could go for the occasion-worthy "Happy Birthday," or "Merry Christmas" on red or green filters, or for the Halo crowd, maybe "Pwned."
Linked via MoCo Loco.