Last of the Autumn Leaves: Leaf mobiles/sun catchers (project page also shows some awesome suncatchers) This is just the idea I had.
Get crafty with paper towel/toilet paper rolls and make some adorable animals! Just add scissors, paint, googly eyes, and hot glue. This is the perfect boredom buster for a rainy day!
A faire avec les enfants via Sakartonn
Let the kids paint faces while an adult drills holes through the top of the acorns.