The StompFuzz is a tiny, fun, and practical fuzz project that gives you a ton of tonal flexibility on top of a 3PDT foot switch. It's a great opportunity to practice your surface mount (SMD) soldering.
You can choose various combinations of the PCB, as well as kits from the drop-down.
Also check out the PicoFuzz and other options.
Documentation and more info here: https://github.com/mstratman/stompfuzz