I did this a couple years ago and thought this turned out really cute. It was a good way integrate math into our Christmas decor. I plan on doing it again this year; once I get back from Thanksgiving break.
I had my students take different nets; cubes, cylinders, pyramids, etc. and they made Christmas tree ornaments.
First, they got to decorate the nets however they wanted, then they folded and taped/glued them together, and then we hung them on our tree!
I will come back and post a picture when we're done. You'll notice there are many different types of polyhedra, which could be available for your students who need a challenge.
I'm so excited to start getting ready for Christmas. Check back here for lots of cute holiday classroom ideas!