But if we know of a project already then yours won't be unique! YOU have to think of the project, then check online to make sure it hasn't been described before, anywhere on the planet.
Pssst, buddy! <opens trenchcoat> Here's a great project that's the easiest project in the world to build -- the parts count is zero except for some connecting wire. Make the circuit shown in the attachment (use superconducting wire). Then cool it to below the superconducting temperature and establish a current in it. The current will continue to flow and you can amaze your friends and be the only one on your block with such a nice project. Use liquid helium and you can also have fun playing with it too.