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.
Some websites offer very basic coloring pages for kids that can be printed off and colored. Others create interactive coloring pages that require children to work on the computer itself to color the images. Unlike the basic websites, the interactive coloring pages are often found on more complex websites that act as a full-fledged community. The coloring pages are only one of many things available to do on a particular site.