Ive taken the stop light behavior management system one step further and added a little Disney magic. On the traditional "green" put Mickey saying "Oh boy Im having a great day!". Yellow is Goofy saying "Gwarsh! I made some mistakes!" and warning them to slow down. And red is Donald saying "I've quacked up - I'll do better tomorrow!". I simply glued these to green, yellow and red and put them in a pocket chart. Each child has a Mickey or Minnie they move between the colors depending on their behavior.
PS - I'd love to extend this and add more colors. If you have any ideas for characters and quotes please let me know!