Attendees of Celebration V can stop by the the StarWars.com / LucasArts booth (booth #1310) for a chance to be "frozen in carbonite" (complete with an optional bounty hunter captor), or to pose as the Secret Apprentice from Star Wars: The Force Unleashed. With your photo incorporated into an image of a carbonite block, or Starkiller, you'll receive a free printout, as well an an e-card.
(Source: StarWars.com)