Toy for young child
This is a fairly simple idea for children at an age when they appreciate rattles. The toy would have two parts: a cyllindrically spiral track about a foot long and an inch or two wide; and a moving piece that is also cyllindrically spiral that would fit over the track and be able to slide along it, rotating as it does so. The moving piece would slide down the track through gravity. The track could then be inverted to get the piece to move again. Various color patterns and noise making features could be added to create further interest.
Reward: Getting credit for the idea