Try to use a themed coloring. For example, a series of coloring books about animals, buildings or machines give children an idea of the objects of the world. Coloring of fairy tales or cartoon characters, are good because they allow the child to "talk" with their favorite characters and express their attitude towards them through colors.
There are different varieties of coloring books nowadays, so that all you have to do is decide whether you need it or not; today you can even download the application for coloring. Currently there are more colorings to choose from than ever before, just select the coloring with your favorite motives, print it out or download the program from coloring website.