Certainly one of the strangest releases of 2013, Viscera Cleanup Detail now has a holiday-themed version available for purchase on Steam, Santa's Rampage. Set in the workshop at the North Pole, players must clean the carnage from a Kris Kringle killing spree. It's on sale now for $1.99 (regularly $2.49)
I think I've commented before on what a clever game Viscera Cleanup Detail is. It's more clever than it is fun, frankly, but how much fun can you really expect to have in picking up bits of unidentifiable corpses and disposing of them? But if you like the idea of a game in which you're the guy who shows up after the action is all over (as I do), you should probably try it.