I am not a skater, but have done a freestyle before.
I picked something I liked, because I had to listen to it a lot while I composed my program and practiced it. And I still like to listen to it.
Don't pick anything that you can't pull off, too slow or too fast.
pick something that you can easily edit to your length. As a matter of fact my program maximum length was 1:30 as well.
As luck would have it, the piece I picked had a natural break right at that point (Evanesence, Going Under)
And in your case, pick something Christmassy?
(Trans-Sibirian Orchestra or Mannheim Steamroller...maybe?)
Do the solo! It'll be fun! (I did a Taekwondo freestyle for a tournament. I had a blast, first putting the pieces together, then performing it)