I believe that every student needs to hear something positive about them self everyday. This can be challenging when you have 25 or more students to keep track of.
I use these tickets as individual behavior reinforcement. When I catch a student on task, being kind, being prepared, etc, I place the ticket face up on their desk so they can read the positive statement about them self.
Students then write their name on the back of their ticket and drop it into a small bucket. At the end of the week I draw tickets out of the bucket and say they name with the affirmation written on the front. The student whose name is drawn also gets to choose a prize from my treasure chest.