Cardboard pumpkins. I know I have cardboard boxes stacked for recycling and yarn stashed for whatever I might need it for. They fit together in a cute way here at Design Sponge. Check out their DIY.
Twigs are Fun for Fall from Hostess with the Mostess
Napkins made from flannel shirts and a coasters cut from branches. One Charming Party
These could be from shirts too!
Bow Tie Napkin Rings from Twinkle and Twine