2016 Christmas - Rudolph, the fused nose reindeer
2014 - Escher in my mind.
2013 - A friend's daughter said about this one: "Is a christmas pirate pilot?", and yes, It's Totoro, the christmas pirate pilot!
2012 - Classic tentacular Christmas
2011 Christmas - An homage to Norman Rockwell
2010 Christmas - An homage to Bill Watterson's Calvin & Hobbes
2008 Christmas - Pixel art a-go-go
2007 Christmas - The Little Old Ones carol