Laura,
For the scoreboard, you can also draw a character for the smilie and frownie, such as Santa or the Grinch, and the response can be "Jingle Bells" or "Bah Humbug".
Another way to spice it up is to create a second tier on your scoreboard for a specific rule that your students are really struggling with. For example, if they are continually shouting out, write Rule 2 under your regular scoreboard, and they can earn points when the class is specifically following that rule. It gets them to zero in on the one thing that is out of control.
Keep the routine and procedures consistent, even through the craziness of the holidays. Bring some fun in, and kep them engaged.
It truly is a wonderful time of year!
Deb