I've just started learning Rust, so I've been working through The Book and Rust by Example to get familiarity with the language before diving into any projects. Coming from a C++ background, I've been surprised at how similar and simultaneously completely different Rust is from C++, and I've run into a lot of things that seemed completely bizzare to me (like the whole immutable variable default and shadowing) that I initially disliked until I looked into the reasoning and became wholly on board with the systems.
I'm planning on developing a cute little pet project for a relativistic/geometric time system, where the current time is determined not by arbitrary time zones but coordinates on the earth. I'll probably post some updates once I start working on it ^͜^