I propose a picture of three magi in B&W referee striped-robes with the caption 3 WISE MEN, to be raised after UMD penalties are called.
Not a bad faux-butt-kissing sign for pregame, too. Kind of like The Farce offering cash over the glass to the refs during pregame.
For your mistletoe, better make it BIG. Perhaps big plastic plant leaves and red rubber balls.
It's probably too late for voting, but I like 1,3,15,20,23.
23 (You Better Not Pout) works away from the penalty box, too, just use it after Sioux goals and when Bulldogs take penalties.