There is an interesting set of books: "Architecture of Open Source Applications" http://aosabook.org/en/index.html
which takes a number of interesting applications (often times< 500 loc) and explains how they work.
Is there something like this for Rust ?
A collection of articles that are (1) it is written in Rust, (2) it's either an elegant impl or does something practical, and (3) I'll probably learn something cool from reading it.
I don't think anything like that exists explicitly targeting Rust, but it sounds like a really good topic if people are wanting to write a blog post.
Of course it's hard to find an application large enough that it doesn't feel contrived, but small enough that you don't need to write a book to explain how it works.