I designed and built 10 of these little lending libraries. We put promotional materials, free books, 3D printed items, and trading cards featuring library services inside them. They were placed all over campus and ended up being very popular.
The outside of the boxes, plus the contents of one. We refilled them every day but still couldn't keep up with demand.
I also designed and built two whiteboards which we placed outside the library for the week. We put the prompts "I want my library to" and "I wish I knew more about" on either side to encourage meaningful feedback from passers-by.
The opposite side of the whiteboard.