Do you know these little cards that you can get through your "flickr" account? They are really wonderful. A sweet little recyclable box, paper from sustainable forests with your own fine art work on them. How much better can it get?
Oh yes, and then there's "Where in the world is Moo?" which is a kind of 100 person round robin. Someone sends you a moo box with however many moo cards and you send it on to the next person after you add your card. When the box is full (100 people, 100 cards) then a new box goes out. Pretty cool!