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.
I know that in this era, computers and gadgets are really booming and bombarding every home. The majority of the parents cant catch up with the inclination but through uncomplicated things like coloring books, for sure, kids can have a superb time with their parents. There are also free coloring online materials and games that you can make use of while bonding with your kids.