I like how simple the expectations are on this poster. I think the hearts limit it, and the fact that it continues after a period without a capital letter! But the ideas are good and could extend from lower elementary up through grade 8.
Used these this year. These are the best- most clearly stated class rules I've ever had. We added "Be safe." to the bottom of it. "Let others learn." has solved a lot of other mini issues that always come up.