Download and laminate these Business Card Sized positive affirmantion cards. There are so many ways they can be used.

1) When you notice a dancer demonstrating one of the cards, write their name on the line and hang it up. Once they've all been given, take them down and start again. 
2) Have them available for dancers to give to other dancers.
3) Have them available for dancers to see on a wall.
4) Have them available for assistant teachers to give to dancers to take home and pin on their mirror.