My favorites would probably be most of the ones for Tales From Space: Mutant Blobs Attack. Oh, and this one Super Meat Boy one :)
To be honest I'm a bit disappointed with how plain a lot of the backgrounds are for some games, I would have like to see more detailed or at least less empty backgrounds for stuff like Dust: AET, Portal 2, Bastion, and a few others. A simple black background with a character is just lacking something I think, especially with how great the art is for most of these.
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