Even though the holidays are almost over, that doesn't mean you cant still have some holiday themed fun... An enjoyable task, which is similar to the coin task for those that are familiar with it, is a "sub tree" task.
Place your sub however you want her to stand, with her arms out preferably. Then tape ornaments of your choosing all over her body turning her into a "sub tree". Set restrictions as to movement, time in which they must maintain position and such. To add difficulty to the task, have them stretch their fingers all the way out, and then place ornaments on each finger. Don't tape these ornaments though, and make sure that they wont break unless you want the sub to clean up the mess afterwards. If they move any, the ornaments will fall off their fingers and onto the floor, thus requiring a whatever form of punishment the Dom sees fit.
Hopefully anyone that tries it will enjoy their own form of holiday fun with their "sub tree". If you don't enjoy it, or have ideas on ways to improve it then let me know.