How about Rudolph The Red Nosed Reindeer and Santa Claus is Coming To Town?
http://www.youtube.com/watch?v=YTlChGL0lsk
Fuckin amazing.
Those were always my favorites. Just have really good memories of them and they feel like such a halmark of Christmas. Plus they tell the most famous and traditional Christmas stories, but with all these random characters and plots. How cool is giving Santa and Rudolph these adventure backstories?
Plus the animation and style is awesome.