Build a conduit out of some simple materials (eg, aluminum foil, straws and cellotape) and roll a ball (or egg) into different receptacles some distance away. The foil would mainly make up the conduit. The straws could act as support. We can make it more challenging by (a) having to go around corners, or (b) use a heavier object such as a golf ball, or (c) go over varying distances without allowing material modification of the conduit. We could make this competitive by making the object delivery a race. For example, we could have three or more buckets at the end (perhaps at different heights, and the conduit design that is the fastest to deliver an object into each receptacle wins.
I came up with this as a way/reason to give out an award for creativity, innovation and leadership. The competition could produce a clear victor based on the quickest time (or success if we use eggs and require that the eggs do not break).