You may have seen this blog already, but the author of "Practical TLA+" has a really fascinating blog with some fun toy examples. I'm a fan of this article where they model A Link to the Past with Alloy, to prove that dungeons are "winnable" [0].

The rest of the blog is really interesting too.

[0] https://www.hillelwayne.com/post/alloy-randomizer/

Feel free to throw an email my way (it's on the website) if you want to chat a bit more about potential use cases.

My spare time is kind of... weird. They were related to concurrency in an actor system, I validated a design and implementation (can’t share much more). I recommend checking Hillel’s blog as suggested, he has excellent examples (and his book is a good starting point for TLA+ and Pluscal as well)