We're suckers for Viva Piñata around here. So sue us.
Rare's community manager George Kelion posted a nice little holiday gift over on the NeoGAF forums: A set of desktop backgrounds featuring piñatas in various scenes from classic film. They can be yours for the low, low price of...well, just click on them below.
EDIT: You can access the high-resolution wallpapers on the Viva Piñata: Trouble in Paradise image gallery.