We came up with this a few years ago for the Thanksgiving season. We call it the Thankful Tree. I placed a twig from outside (we found a lilac bush to have the best little branches) in a small pot and then filled it with Plaster of Paris. You can find this at any craft store. After this dries place a little bit of moss on top around the twig.
I then cut out some varies colors of small paper leaves , hole punched the top, and threaded a piece to hemp (or string) through.
I then attached this little poem that we had written. You can then write things (or draw pictures) on the leaves and hang them on the tree. This a fun to do throughout the month or on Thanksgiving day. These also make fun little gifts.
I also think that it would be fun doing a similar thing with bigger paper leaves and hang your "Thankful Leaves" on a piece of twine or ribbon. Something like this at Pottery Barn.