Mandalas are fantastic for focusing the mind and creating a sense of peace and stillness for the person who is coloring. Use these as an activity with your students of ALL ages. 
For smaller children use mandalas that are less intricate and use crayons.
Provide more intricate mandalas for older children/teens and use colored pencils so they can manipulate the smaller detailed spaces.
Mandalas are great for classes that explore stillness, meditation, or deep breathing (ie, week 3 of the 6 week YoKid Program.)
You can download and print them for free online. Below are a few sites to try:
