The Elf on the Shelf is my favorite tradition. My kids LOVE looking for our elf, Rudy, each morning and it's the first thing they think of when they wake up. Here's where he's been so far.
 

December 13 - Mic check 1..2..1..2

December 12 - Ride 'em Rudy

December 11 - Elf in a bottle 

December 10 - Thirsty Rudy in the fridge

December 7 - Admiring baby Jesus

December 6 - Born to be Wild

December 5 - Rudy found the marshmallows

December 4 - Peek a boo

December 3 - Just hangin around

December 2 - Rudy returns from the North Pole!