I use this chart for behavior interventions for a few of my students. It really works in keeping them motivated in a positive way. Instead of calling a "behavior chart" and making it sound negative, I have rephrased it to be a "motivation chart" to help the students look at it in a positive way.
Feel free to customize this to fit the needs of your students. In the two boxes at the top I usually choose graphics that are unique to each child. Check out www.mycutegraphics.com for some great images.