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 dont 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.
Coloring in is one of the main starting points of creativity in children. Being able to expressed ones self with a piece of paper and colored pencils or crayons is a great thing to be able to do and remember, it leads onto being able to learn other brand new skills. Quick tip! If your child has difficulty holding a colored pencil then try them with crayons first. Crayons are easier to hold because they are larger and softer. But as your childs skills and abilities progress they will prefer the greater accuracy of using colored pencils.