Displays are one of the easiest and most effective ways to enhance the library environment and stimulate thinking, ideas and promote events and resources. Even the smallest and oldest of libraries can be invigorated with some clever signposting and props. Listed below are a range of resources about library displays. I am sure you will find some useful ideas.
Twenty Rules for Better Book Displays
School Library Displays - no longer updated but still some good ideas.
Pinterest Library Displays