I took three of them and popped them in the microwave for 20 seconds and then stirred in enough icing sugar to make them kneadable. (about 2/3 cup) Kneaded until smooth. wrapped in plastic wrap and stored in the fridge.
Egg Nog flavored fondant!
If you don't have EggNog flavored marshmallows on hand (I mean who does normally?) You can make other flavors using store bought marshmallows, food coloring and extracts.