So why the fascination, and how can they help you?
My youngest child enjoys saying that the care bears must be a million years old, the same age as me. As I stare at him I do not laugh because he made a funny statement but because I imagine the day when he is sitting at the table with his child and they make the same joke to him.
The material. Some coloring books offer the ability for the child to simply run over the surface with the pens or crayons provided, and it will turn out to be the right color regardless. Some are more like paint books, and some have magic marker surfaces and come with markers that will not show up on any surface but the specially prepared book pages. Choose the book that best suits you and your child. If you are worried about markings on the walls, then don't select a pack of basic crayons, get something that uses special crayons. If you want your child to exercise their own creativity and not have to fit in the lines or color schemes planned, get basic pages. It is up to you.