We used this reward chart for Willow when we were trying to 'catch her being good' and reward her for her good behavior. 

The set includes both a pink and blue version; the idea is that they can gain stars or hearts (we would color them in with a whiteboard marker) but they can also lose stars or hearts for bad behavior/choices. We would negotiate a reward for her for when she got the princess home (all the hearts were colored in). It was really great for catching her being good, teaching her consequences and for reinforcing her good choices and behavior. 

I suggest printing in A3 size and additionally laminating the chart, we also strongly suggest using either chalk pen or whiteboard marker to write on the chart.