As a reward on Fridays we have Fun Friday. When we cannot go outside we have various centers. The rules are flexible but in my class no more than 4 students can be at a center at once. All students must wear a clothes pin clip for the center they are at. Students are allowed to switch centers provided there are not already 4 people at the center. They simply go to the chart and exchange their clip for a new center clip. You would need to print, cut out, and assemble this chart. You would also need clothes pins. If you have other center ideas please let me know!