Zubbles is a commercial name for colored soap bubbles. Zubbles claim to fame is that they are the first colored soap bubbles that do not leave stains. Instead they fade away with exposure to air, pressure, and water. 
Popular Science named Zubbles the "Innovation of the Year" for 2005. Readers Digest' agreed, saying they were one of the "Best Innovations" of the year in 2006.