The Little Drummer Boy, particularly the Crosby/Bowie video version
The calm of Christmas Eve/Christmas/Boxing Day after the shopping storm
The aura of goodwill
A Charlie Brown Christmas
It's a Wonderful Life
The late 80s Superman story from a "Christmas with the Super-Heroes" special
Lights and glitter
The renewal of hope and the possibility of a better tomorrow.
None of this in any particular order. I may get curmudgeonly about certain aspects of Christmas sometimes (rampant consumerism, chiefly), but any even that gets people to think about kindness to others and peace on earth...well, that's an event worth celebrating.