Some years ago we made Advent ornaments, based on the Jesse tree idea which follows the story of Jesus, out of playdough.
Here is a good recipe:
4 cups of flour
◊ 1 cup of salt
◊ 1-1/2 cups of hot water
Bake in a microwave. Using a microwave-safe plate (not paper or cardboard), microwave a plate of ornaments for 1 to 4 minutes, increasing the time by 1 minute increments and keeping a close eye on the microwave as the ornaments bake. Microwave power levels differ, so use high power in a less-powerful oven, but lower if your oven heats things very quickly.
There is another lovely idea: making boxes out of Christmas cards.
And then wonderful paper snowflakes: