I use these posters on a bulletin board in my classroom. Each student has a clothes pink clip with their name or number on it. They can move their clip to represent their behavior choices. Everyone moves back to green at the beginning of the day. Each poster has a colored smile or frown face to represent choices. They read as follows: Green is Great!, Yellow is a Warning! , Blue: Think About It!, Red: I can do better!
Posters are on PDF formats, however I included one word document so you could change wording if needed.