This bass is made from a wooden boat paddle, a piezo buzzer, weed eater strings and a few other odds and ends. For what it is and how little it costs (20-25 dollars with all new parts), the quality of sound is unbelievable. If you're thinking about taking up bass or already do and just want to have something different, this definitely would be worth making.
Here is a rough (aka bad) video to demonstrate how it sounds with no effects:
Also, here are some references and inspiration: