@analogoutput mentioned his first Kosmo module, Mikrokosmos, in the build thread, but I think it deserves its own thread in the Kosmo Modules category.
I was lucky enough to trade one with him and I’m super happy with it. The attached Piezo is a lot of fun, but it’s also a great preamp for any piezo-equipped item, like a rusty old Kalimba I have. I will try to get some sound samples put together at some point, but for now here are my build pictures. I sanded down a bit of the back side solder mask and soldered the Piezo straight to the panel like on the Music Thing Modular original: