Coloring books are where most kids start to develop their artistic dexterity. They are available relatively cheap, they are often related to cartoon characters or objects familiar to very young children. They provide guidelines for children who are learning to control their hand movements by "coloring inside the lines".
Coloring books for adults is an offspring of art therapy which is a mental health profession that is the process of making and creating artwork which intends to "explore feelings, reconcile emotional conflicts, foster self-awareness, manage behavior and addictions, develop social skills, improve reality orientation, reduce anxiety and increase self-esteem" (according to the American Art Therapy Association). So basically, it's similar to good old therapy. Also, art therapy is not only about mental health and improving yourself - it's a form of personal expression, as well.
Just like reading stories in picture/illustrated books with their children, parents often use coloring pages to teach children and stretch their imagination. Standard coloring pages provide outlines within which children can color, but some art educators believe that free-form pages are an even better tool. A good example of these coloring books can be found at CreativeColoringBooks.
Aid in Teaching. This websites can aid the parent or educator in teaching as you can search for printable coloring sheets to reinforce the lessons being taught. Children are often able to understand the lesson after many forms of teaching. Adding a coloring project to learning the alphabet or shapes will help reinforce the lesson in a fun way that children will enjoy.
I can recall vividly my father introducing me to coloring in sheets as a hobby, and now I am doing the same with my child. Never mind how the world changes, our children nowadays love to color in just as much as we did when we were young. Kids love to show off what they can do by using their paints on the coloring sheets you give them.
Of course it takes a little bit of creativity to get the coloring page activity to be fun. For example if there is a festival just round the corner then get your kid all the coloring pages related to the festival. That way he or she can lean about all the festivals. Make sure to make this fun and interesting by inviting other friends of his age group to your home and have a nice contest among them. Better still tell them to create images of the festival activities and let them exchanges those drawing sheets with each other for coloring.
Affordability. This websites are a great way to introduce new and affordable activities to your children. Many online coloring sites are free. However, some may require registration. In addition, there is huge selection of printable coloring sheets on these online coloring sites that are free to print. You could introduce a new coloring activity to your children daily for only the cost of printing. The ability to print coloring pages online gives you the opportunity to print whichever character or image you child desires without having to purchase multiple coloring books.