Examples of books with interesting or experimental illustrations/expression:
Check out Holman's website for examples of their felted work and books at: https://holmanwang.com/
Check out this video to see how they did the Star Wars books:
Contains loads of interesting fonts and layouts for readers to explore as they search for items that begin with each letter of the alphabet. 
Check out Graeme Base's website for a few more examples at: http://graemebase.com.au/book/animalia/
Book preview / advertisement from the publisher's website:
