Classroom B-day idea. or just a great community builder mid-year. This is seriously one of the sweetest ideas. If there is no smartboard in your room maybe you could do it with large bulletin board paper. Then they could keep the kind words.
"Me Bag" The students' "homework" for the first day of school is to fill up a brown paper bag with 5 or 6 things that are important to them. Over the next several days, they take turns sharing their bags with the class and talking a bit about themselves.
Task 1 - Shaping Behavior I would use this system because it "compliments" the student on the desired behavior. I like that they are complimented for what the do correctly and that once they get so many stars they can trade them in for a prize.