Read Kindness is Cooler, Mrs. Ruler - Random Acts of Kindness Board. Meant for a teacher to use in a classroom, but great examples to give your kids of things they can easily incorporate into their day to make someone else's day better.
when students participate when no one else is or answer a challenging question they can get 'smart beads' to wear. they trade in smart beads at the end of the day for a little note that goes home to their parents! wouldn't call them smart beads tho