Moody Cow Mediates by Kerry Les MacLean is a great book that I have been using with students from Pre-K through 5th grade. Peter the cow, is having a bad day. He missed the bus, crashes his bike and scrapes his knee. He is so angry that he picks up a baseball and throws it through the window. His grandfather uses a jar of glitter as a representation of Peter's anger and teaches Peter to settle his angry thoughts. Grandfather uses a gong to start and end the meditation. For school purposes I chose to change the word "mediation" to "mindfulness". It works just as well and students are already familiar with mindfulness. You can purchase Moody Cow Meditates HERE.