We play a version of a dice game called Bunco. We all wrap up any strange Christmas gifts we've received or found at the dollar store along with a few nice prizes and place them at the center of a huge table because the game can be played by all ages (which is why it's so special). Starting with the head of the family everyone takes turns rolling the dice. Anyone who rolls doubles gets to take a package from the pile.
Once all the prizes are gone a timer is set for 10-15 minutes depending on the number of prizes/people playing. During this period, if someone rolls doubles, they get to steal a present from anyone who won one in the previous now. Since no one knows what is in the packages, the choice is based on size or wrapping paper. Sometimes the person who donated the prize gives obscure hints or even says "you reeallllyy don't want that one! Trust me!"
Once time expires everyone gets to open what they're left with. The kids really love this game and the whole family looks forward to Bunco. Sometimes it seems like the kids like the Bunco prizes better than all the Christmas presents.