Would be cool to see a port or remake of the old Windows 3.1 game, Ski Free, and some selectable christmas music. Replace the ski man with a skiing santa, or riding a sled. If that counts as x-mas related theme.
If you were referring to biblical, then maybe a side scroller where you control one of the three wise men. Or the other wise men if more players. Different obstacles and puzzles a long the way. The goal could be to make your way to the stable were Jesus is born. To make it interesting, the gifts could be stolen and you have to find every piece as well.
OT: How much would a cart like this cost?
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"Two things are infinite: the universe and human stupidity; and I'm not sure about the universe."
- Albert Einstein.