Available with crayons: Most of the books come with crayons; this means that you dont have to buy them separately. If you dont know how to use wax crayons, by buying such a thing, you can always learn something new in life and relieve all the tensions that you have in your mind. You can design and color whatever you want to: While some of the books have limited designs, there are others that let you design something on your own as well. If you are more of a creative and artistic person, you might want a book that lets you be independent enough, in terms of designs.
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.