As much as my monsters fight me on bedtime, they never manage to make it to midnight on New Years. Here's a way for your monsters to enjoy "fireworks" and still make it to bed on time (besides the early Netflix countdowns of course).
Cut the ends of paper tubes into strips (the longer the strips, the "showier" the fireworks).
I used paper plates to pour the paint into (easy clean up = bonus!) and let them have at it.
The monsters' art came out much better than mine, but they gifted them to their Poppa before I could take a photo.