Gingerbread AT-AT. The Battle of Hoth was never so delicious! (Non-Christmas related, but still awesome: Lego Battle of Hoth.)
The Battle of Pelennor Fields as Tolkien intended: In candy. Mmmmmmm... orcs...
Dalek Christmas Tree. Nothing says "Merry Christmas" like shrill cries of "Exterminate!" coming from your tree!