Last of the Autumn Leaves: Leaf mobiles/sun catchers (project page also shows some awesome suncatchers) This is just the idea I had.
Fall - Fall leaves sensory soup: water sensory play for toddlers and preschoolers
Leaf printing - on shadow drawing?
room decor Try this DIY glitter leaf garland project this weekend with your kids to get your home ready for the holiday entertaining months. Hang it above the mantel in your family room for a fun way to spice up your fall decor.