Creating buttons for the students to wear highlights student effort and gives students the opportunity to be proud of, and speak about, their specific accomplishments. They could say super star, great behavior, or ask me why... they can be changed in and out which is nice that way if something special happens you can make a button for the event.
Give kids a "Secret Service" mission. Tell them for 1 week, they have to do something for someone else without "blowing their cover." A fun, interactive way to get kids serving others. This would be a great class meeting activity and topic.