I use this in my classroom along with the Class Dojo App. I allow my students to save up their points to earn prizes. I tried using smaller points for smaller incentives, but they weren't as motivated. They like seeing their points go into the hundreds! I hope you are able to use this in your classroom as well.
Font: Frente H1 from Font Squirrel
Clip art by: Tales from Outside the Classroom http://talesfromoutsidetheclassroom.blogspot.com