There are four common reward types that we see on Kickstarter:

• Copies of the thing: the album, the DVD, a print from the show. These items should be priced what they would cost in a retail environment.
• Creative collaborations: a backer appears as a hero in the comic, everyone gets painted into the mural, two backers do the handclaps for track 3.
• Creative experiences: a visit to the set, a phone call from the author, dinner with the cast, a concert in your backyard.
• Creative mementos: Polaroids sent from location, thanks in the credits, meaningful tokens that tell a story.

No matter what you decide, make sure it's clearly formatted and easy to understand - otherwise, backers won't bother to read everything. Here is another example from the Pebble campaign: