You have a greater tool - your PC - that can be helpful to get the printouts of diverse colorful sheets. Guide the children, exclusively during the holidays to add illustrations to the colorful-page, and showcase them around the prominent places of the house. This will give them, a sense of pride and joy for their creativity, and would lead to further productive pursuits. Thus, you will witness that there are massive advantages of coloring-page relatively to coloring books. Coloring sheet are economical, costing you only a couple of cents in ink and paper rather than a few dollars for a coloring book.
When you sit with your child and see him coloring on a book, you feel completely relaxed. Colors are all that you need to relieve your anxiety, depression and even stress. There is a sudden change in the mood of an individual, when he exposes himself to different shades of different colors. One look at red, purple and green shades and you are emotionally out of all the problems in your life.