Not much by way of typography (it's URW Classico for sans-serif and Baskervaldx for serif), but I hope you find the book that I'm writing worth of this thread. (Latest version here: http://bit.ly/2JuJxTJ)
It relies on a heavy use of tcolorbox for definitions, exercises, examples, and end-of-chapter projects.
Book cover: 
Table of contents: 
Beginning of chapter: 
Exercise and definition: 
Table: 
End-of-chapter project: 
End-of-chapter summary: 
I still have some issues to solve, as seen in the second of these "example" boxes:
But by and large, I hope that the use of the different kinds of boxes makes the different kinds of contents easier to localize, as well as making the flow of the text somewhat less... tedious?
