Fill a Bundt pan half full of water. (If you don't have a Bundt pan, fill an 8-inch cake pan halfway with water and place an empty yogurt container in the middle, which will help form the ring.)
Gather bits of nature: Things like pine needles, pinecones, red leaves, and berries work well. Arrange them in the pan.
Put the pan in the freezer until frozen solid. Pop the sculpture out of the pan and loop a ribbon through the ring. Hang it from a branch and enjoy!