Recycled Toilet Roll Ball Drop Game with Ping Pong Balls! Great for toddlers and preschoolers! We totally did something like this in China for C only instead of ping pong balls we used food pouch tops.
Marble run made out of toilet paper rolls and paper plates. Ok, so this was a rad idea but pretty tough to do with 2 kids. It would have been good with just my 5 year old. The kids got frustrated that it took so long. I ended up finishing it with a Martin