From seller ProdMod, this cool kit for making your own color-changing LED hula hoop that collapses for storage like a band-saw blade:
Use this kit in combination with 10.5 feet of tubing (sold separately) to build your own LED hoop. This is the easiest of my kits to assemble. The battery lasts about 5 hours of continuous use, and can be easily replaced for a new one. This kit includes: One Lithium Battery, 12 feet of paired wire, One Slide Switch, One Tube Connector, 21 LEDs.
A rechargeable hoop kit is also available, which includes a rechargeable battery, a charger, and an integral charging jack to install in the hoop.