Here are the supplies you'll need: Some pressed leaves, a sharpie, some string, scissors and a hot glue gun.
You can do this project in less than 5 minutes. If the kids want to "help", it may take 10, but it's still super easy. The results are fantastic. Take your pressed leaves, and write on them with Sharpie. I wrote "Thanks", but you could write: Happy Thansgiving, Give Thanks, your Family Name, whatever.
Then, take the leaves and put a bit of hot glue at the base of the stem, then stick them to the twine or string. I added a few extra leaves with no letters at the ends just to add more color. You can stack the leaves for more texture, too.
If you make a fall banner, be sure to link back, I'd love to see it!