13 Rue del Percebe (13, Barnacle Street) (an example here) has been one of the most traditional examples of surreal humor in Spain for ages. Following that kind of humor, Orange Spain released an interesting project (done by Binaria) last Christmas called "El misterio del arbol" ("Mistery of the tree"), a series of animated episodes where some characters living in the same neighborhood have to find out who has stolen the Christmas tree.
Here's a little teaser trailer:
The interesting thing is that the site allows the user to customize some characters using Facebook Connect and replacing the original faces with his/her friends', so each episode, animated ala South-Park-style, gets a different taste and reasons to be spread. Worth a look, although in spanish, it exceeds the traditional Christmas card and reveals a whole 6-episode story.