Easiest (And cheapest) Fall Craft Ever!
Step 1: Collect fall things - leaves, pinecones, acorns, etc.
Step 2: Pour a LOT of craft glue on a paper plate. You can use Elmer's, but it takes much longer to dry.
Step 3: Let your preschooler stick things on as she wishes. Add more glue when necessary. (You could also get some fun autumn colored glitter and jazz it up a bit.)
Step 4: Let it dry over night. Hang up as a fall wreath (not on a door since lots of movement might cause the items to fall off).