These reflections, 25 in total, were put together by young people from the UK! They’re based on the daily readings of Advent 2014. See the rest on their youtube channel, here.
There are loads of short animations like this, around one for each day of Advent. Check out their playlist on youtube for them all.
ChurchLeaders.com has two Christmas games for you to use: Fruitcake Mayhem and Living Christmas Tree.