I printed these on index cards for use with my behavior management program. I printed the smilie face on green, the next on yellow, the third on orange, and the last on red. I put these in library pocket cards and each child had a set. If the child had an offense they flipped their card. I had the following meanings for the cards:
Green - Great Job, you are making good choices.
Yellow - Warning, think about your choices
Orange - 5 Minute time out - rethink your choices
Red - Phone Call Home - loss of a privilege
These worked wonders for me!