I stumbled upon this pinterest site that has lots of amazing ideas for setting up and organizing your classroom. Many of the pins seem better suited for elementary grades, but some can be applied to secondary grades too, such as how to rearrange desks, what to do with art supplies, and decoration ideas. If the link is broken, search for “pinterest classroom setup & decor.”
Edit: there is also this buzzfeed page with lots of great ideas as well.
