Workshop link:

A fun little gift box active item just in time to be late for Christmas! When opened, spawns a random item from the current room's item pool! But be warned, you might just find a Lump of Coal or some Poop inside, deserving of a very bad child such as yourself. What will be inside?

Can be found and purchased from Shop item pools.

This is a rather simple item, but if you encounter any bugs, be sure to let me know!