The net, activity booklets in dollar stores, family restaurants, or even sometimes at public libraries are sources of coloring pages, simple black and white drawings most commonly of cute cartoon characters.
My kids turn into saints once they see the coloring sheets rolling out of the printer. They love it when I start passing out coloring printables with their favorite characters on it. The most valuable aspect of coloring pages are there educational value. They will help your kids with their motor skills i.e. finger dexterity, eye-hand coordination as well as increase their mental capacity. The list goes on regarding the benefits of allowing your child to color versus playing video games or watching television.
Studies have shows that anxiety levels dropped in adults that colored. They did note that simple doodling had no affect on anxiety. The focus on coloring and switching off the brain allows that blocking of anxiety in the moment. Coloring does not have a need for complicated thought processes and like listening to calming music, you are able to get within yourself, isolated from external anxiety, commotion, and distractions.