This is my new favorite fall book. It's "The Little Yellow Leaf" by Carin Berger. It's about a little yellow leaf who is not ready to let go of her branch. She hangs on until she thinks she's the only leaf left, but she sees one more leaf who also isn't ready to let go. Together, they decide they're ready, and they let go and fly in to the wind.
I love this book mostly for the pictures. They're very fun to look at and very fallish because of the colors she uses. They're a little bit modern in style, and I really like it. See if your library has it or add it to your home library. It's a beautiful book to add to your shelves at home.