Diploma to give your students weekly. Every Monday you pick The Star of the Week; someone who has worked very well and who has tried very hard at work.
Something I usually do is to give the star of the week certain benefits:
*He can eat a little snack in class.
*He can help with dojo points.
*He helps the teacher with every thing.
*He gets this diploma. :)
*He gets a handwrist, or a crown, or a cape to outstand.
There are many other benefits you can give your star of the week. Be creative!