Simple preschool color matching activity that will also work on fine motor skills -- pushing colored popsicle sticks into an old coffee can! This activity not only develop cognitive skills, but and fine motor
Toddler threading activity with giant cardboard beads. Could be a little project to have them paint the tubes, let them dry, and cut the tubes into smaller lengths (with some help). Add stickers for decoration and even more fine motor practice!
Wall mounted ball run. This would be great for kids who are too young for the marble runs. Could be used as a music installation if there are movable obstructions in the pipe that make sound when a ball touches them