Submit a holiday video featuring Northrend by December 20th to Machinima.com and you could be a winner! The video that Moo posted is, of course, well put together and has a simplistic version of "We Wish You a Merry Christmas" playing in the background. Gnomes are represented too, so all you gnome lovers out there should be happy.
The content itself has a pretty nice grand prize: a Frostmourne Sword replica. I want one of those. And if you do too, head over to machinima.com for the full rules and enter. Good luck!