Piñata Vision
From PinataIsland.info, the Viva Piñata wiki
A never-before-seen feature called Piñata Vision allows players to plug in an Xbox Live Vision camera and interact with the game through the use of printed cards that feature a unique barcode. With Piñata Vision, gamers can simply flash a piñata card up to the Vision camera, and the content will drop directly into the game.