Peace Out is a great series of guided meditations created for relaxation. They can be used to help children find their calm, happy place.
This is a printable colouring book.
You can either print this document or follow the instructions from your screen.
You can print these cards, cut them out and have students choose one when they need a break. Then complete the mindfulness activity as a group or individually.
For more information about mindfulness and lots of video practices for for kids check out Mindful Practices: Take 5ive.