Light painting LED orb

My daughter and I have been experimenting with light painting, producing interesting photographic effects by leaving the camera shutter open for a long time in a dark room, and moving various kinds of lights in front of the lens. One popular piece of equipment for light painting is generically referred to as an 'orb tool', a light source on a string that you can swing in circles. There are fairly simple ways to make them by taping LED light strings into bunches or modifying flashlights, but I wa