Well, it's a little late, but I haven't seen many of them yet... For some reason I'm a fan of this sort of thing.

It's kinda neat seeing Japanese companies doing things like this..
(In case you didn't know, it's a tradition in Japan to send your friends, relatives, co-workers, etc. New Year's cards to celebrate the passing of the year)



Here's the gallery (including ones from Sega, Treasure, Konami, Square, etc):
http://game-science.com/features/nengajou04/