Here we have the 3D printable Christmas Countdown, complete with little Snowman day marker.
For added effect do a simple colour change as the words and numbers are printed so they stand out, same goes for that little snowman :).
It's not very big I purpose so you can have a little desktop countdown, or maybe give it to the Christmas mad person in your office?
Picture of the countdown printed with a 0.6mm nozzle added, I think with a 0.4mm nozzle the numbers would look slightly better.