Stargate Studios demo reel showing what you can do with Green Screen (or Chroma key). Stargate has studios in Los Angeles and Vancouver with over 150 artists, supervisors, and producers covering all areas of digital production and visual effects.  Stargate Studios provides a turnkey solution to high concept film and television production and is the only independent entity which blends all the available production technologies into one fully integrated, high tech production and editorial service.

See also:

• How to build a mobile green/blue screen
• Building a Chroma Key on a low budget (Google Knol)
• How Blue Screens Work