When it comes to television, I always liked the Eek The Cat Christmas specials. I think there were two of them. Back in the day they'd always used to air on the BBC, and I always made sure I caught them.
Then there were the claymation Robbie the Reindeer specials, which I thought were cool. IIRC, the narrator was Robbie Williams, and Robbie was voiced by Ardal O'Hanlon. I remember it had this funny gag where Santa and the reindeer were listening to Seal's Crazy, and it was actually a seal singing 'Crazy', who is then promptly awarded with fish.
The X-Men episode Have Yourself A Morlock Little X-Mas was cool, too. Very sugary sweet, but it'll do for a Christmas special. Lots of funny, almost OOC arguing moments between Jean and Gambit in the kitchen. And Cyclops tries to sing... but fails miserably.
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clarity of thought before rashness of action