I can think of several Christmas movies actually. ^^; Depends on if you're going for a more "grown up" kind of movie or a kid's movie.
And Technically...The Nightmare before Christmas qualifies as both a Halloween and a Christmas movie!
Some good views would probably be...
Rise of the Guardians (This one is more adventurous and a kid's movie, it has Santa Claus and the Easter Bunny in it)
For comedies I recommend....
National Lampoon's Christmas Vacation
Jeff Dunham's Christmas special (if you like stand up comedy)
Christmas with the Kranks
The Santa Clause (The original was best, but I did like the second one. The third one got a little crazy and out of hand)
My mom loves Home Alone and Home Alone II: Lost In New York by the way...but when they got to Home Alone III It was kind of lame because it wasn't the same kid and I don't think it took place during Christmas either.
Elf (Another family friendly comedy)
And technically the first Gremlins qualifies because it takes place at Christmas...and we Halloween fans love a good movie that involves little monster critters in it.
I do have Sonic's Christmas Blast...it's not the greatest but me being a Sonic fan it was a must have to have in my Sonic collection. Oddly enough the story puts a lot of emphasis on having presents.
Another good kid's special would probably be the My Little Pony Hearth's Warming's Eve special
Other cartoon and sitcom Christmas specials.
For classics I would probably recommend "It's a Wonderful Life" a little Trivia is that a scene from that movie appears in National Lampoon's Christmas vacation
And of course you have to have all the cartoon classics like Frosty the Snowman, Charlie Brown's Christmas, Rudolf the Red Nosed Reindeer, Santa Claus is coming to town, the year without a Santa clause etc...
I did enjoy Arthur Christmas and thought it was cute.
There's tons of them actually. My mom is a huge Christmas movie person so of course I know a lot of Christmas movies. Not an exhaustive list of suggestions. ^^;