Here you can watch a video with lots of ideas for your project. You have thousands more on Youtube!
Remeber the steps:
1) Decide on the task that the device is going to perform (keep it simple!!)
2) Decide on with kinetic energy transmissions you are going to use (there has to be at least 3)
3) List and gather the materials
We will present our projects after Easter, so you still have a lot of time to think of ideas.