Also on these boards
A nice, efficient way to display what's important to your class. If the students are older, the teacher can write one example and the students can write their own "we do..." statement.
Adorable positive posters. FREEBIE! Could be a starting point for students creating their own.
First day class rules: I actually have this taped to the inside of my classroom door. After my students see these (and chuckle a little), my rules don't seem so bad.