The lines of your coloring page are the rules you need to share with your team, share with them the boundaries. They are more likely to stay with in the lines if they know that they exist. Next by holding the work up for group and team acceptance they become their own self policing force. They can set self expectations and make constructive self criticism as well. The reward is acceptance and recognition from the team, an old saying is that a person can starve without any feedback, but only needs one good compliment to be filled to overflowing.
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.