This is a good list of pointers to remember when decorating a classroom. I like visuals and would probably be guilty of putting up too much at one time. I loved the question "Do the walls need Ritalin?" as a reminder to tone it down!
Cell phones in shoe organizer with student numbers. They are at the front of the classroom so all have clear view of their phone and can't say that someone "messed" with their phone. They are numbered to indicate which phone belongs to which student. I like this!