Crisco1492: I've always been a fan of the 1960s
Rudolph the Red Nosed Reindeer claymation special. Even when I was living in Indonesia, I tried to make sure my son saw it. He didn't like the Bumble, though!
Also,
Jingle All the Way is fun one. At first, it was a guilty pleasure. Then, as I became a parent, and as I saw kids get enthralled with the latest fads, I realized just how true-to-life it was.
Santa is a big claymation fan as well. He left something in your stocking.