Hunting on Google Patents, found some interesting ones...
3531635 - John L. Hancock's patent on the oil glitter, shown in the MasterCrafters "Magic Lite"
4072855 - Italian patent for the solvent glitter!
6681508 - That awful plastic blender thing Lava called a "magma lite" that sprays up Wave Machine fluid and makes tinny electronic whooshing noises. Patented by people at MIT??
3174688 - Patent on rain lamps. Shows some mind-blowing ideas I wish I could try to build, including: X-shaped and tied-back curtains and a spiral design. Wow.