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:
42" paddle machine heads metal casing from hanging work light 1" piezo buzzer 1/4" jack thick felt with adhesive back two different gauge weed eater strings (I used .65 and .80 that I tuned to E and B) various nails and screws a pencil split down the middle
As far as the paddle goes, I used a SeaSense from Wal-Mart, but I'd suggest to try to get one from a sporting or camping store mainly because mine seems flimsier than others of the same brand but from another store.
Also, the machine heads can be either for a bass or guitar; a guitar machine head can hold a piece of .80 weed eater string with no problem.