How many times do you find yourself picking up garbage at the end of the day? Have you ever had a kid sit down in a desk and complain it's wet from the previous class? How about that board on the side of your room that kids write on when they're not supposed to? These signs are a small part of managing that. Maybe these reminders will work. Maybe they won't. But they sure are pretty and a simple start to managing the mess that wasn't a part of your lesson.