More ideas from blažena
Busy Board, I would make a few changes but this is a cool idea!

Make a "latch board" for kids to explore - Hardware items such as latches, hinges, locks, clasps, etc.

Cup Challenge - groups work together to stack cups in a pyramid using string and a rubber band.

Collaboration Activity (good for mentor time) from: In the middle: Life as a seventh grade language arts teacher. The Cup Challenge - teach students how to work in cooperative groups with this simple and fun challenge.