@mhoye
I've been using the LFSR from the game Pitfall as a practice problem. I keep starting from scratch every so often and see which stylistic and aesthetic choices I keep. Not unlike a painter doing many takes on a scene. In fact, this has been more an art therapy and meditative exercise than hobby coding. Or a mix.

Anyway, an example of some of the POSIX shell script implementing the Pitfall LFSR in the fully justified style. This one is 40 columns x 24 lines, so also organized in "blocks" or "cards", another arbitrary constraint I picked, inspired a bit by HyperCard). The intent is to homebrew a "notebook" coding style (think iPython / Jupyter notebooks) that I can use across any programming language (or config file or tiny DSL etc.).

It's slow going because it's art therapy, but it's also paying off when I tackle new things (like a Skyrim mod manager CLI in CMD.EXE batch script). I don't just think it's navel gazing, though it's also a lot of navel gazing on my part.