Collect paper towel and toilet paper tubes. Wrap tubes with construction paper. Glue a magnet to each tube. Create your marble run, place a container on the floor, and drop in a marble. We had to use a large wooden bead because the marble was too heavy.
Norah has had fun making different runs.
P.S. I saw a fridge marble run available for purchase in an educational toys magazine and it was out of our toy budget! So can we call this upcycling?