Today there is a large set of coloring books. You can find coloring-cursive books, books outliners, for boys (all sorts of appliances, machines, robots, etc.), for girls (fairy-tale characters, dolls, funny funny little animals). There's even a wallpaper coloring books that opens a wide field to have enough space for young artist.
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.