http://www.msnbc.msn.com/id/24162063/

An artificial foam cloud in the form of a peace sign floats in the sky. The formations, created by Flogo, are made of a soap-based foam laced with lighter-than-air gases.

The company uses re-purposed artificial snow machines to generate the floating ads and messages, dubbed Flogos. The machines can pop one Flogo out every 15 seconds, flooding the air with foamy peace signs or whatever shape a client desires. Renting the machine for a day starts out at a cost of about $2,500.