I don't have any custom stationary, but I've looked around at stores near me (there isn't much). I bought a stamp kit the other day, and some envelopes for some possible future use.

My zk is still largely unorganized, and I'm trying to build something that will serve a handful of purposes (fiction and nonfiction writing, as well as the study of philosophy and history, and different journaling practices). It's coming together, though I'm not exactly sure what to do with the stamp yet. For now I'm content with "save my hand".