In fact, a few update has just been released by Naughty Dog which will help you really get into the Christmas spirit. Announced on their official website the free update includes all sorts of different goodies. Like, Nathan with his head wrapped in a gift pack or character wearing t-shirts branded with pictures of candy canes and Naught Dog President Christophe Balestra.
Furthermore, the update also contains a free multiplayer map containing blocks only with no textures what so ever.
The free update is live and ready to download right now on the PS3. This update will remain live till the 8th of January.