I've always wanted to do this but haven't found the perfect old ladder yet... An old wooden ladder turned bookshelf.
Gorgeous bookshelves and libraries.
I remember when I first saw these and I immediately told my dad that I wanted my room to have these in it.
Tree Branch Shelf
Make a Mandala bookshelf. Get inexpensive square bookshelf sources!
A tree branch bookshelf is perfect for a child's room