When I was on my first teaching practice, I witnessed a teacher using a sun, grey cloud and a golden sun.

This was used according to the child's behaviour. When a child was extremly good all day, their individual name peg was placed on the golden sun and likewise if the child misbehaved, they were placed on the grey cloud.

Each child started the day fresh and started on the sun. With having the golden sun, it allowed you to also praise the children who are good all the time, but also you are able to encourage the children who misbehave to redeem themselves.