The third module I created myself is the Tic Toc module. I often annoyed me to use a VCO as a clock, because then I had one missing for creating sounds. The design used in this module is by Circuit Abbey Tick Eurorack Clock Kit. In this PDF, you find the schematics as well. It is a simple 555 Timer circuit which perfectly does the job. I've just added a second output which first is lead over a RC circuit to form some kind of triangle. If I don't need it, I have 2 pulse outputs, which can be perfectly used as a clock module.
I especially like the dog button I've created by my own. It's a childs toy. I've cut off the head, drilled the hole and fixed it with some glue.