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.
Did you know that Carl Jung ordered some sort of coloring to his patients? The psychoanalyst asked them to fill paint into the cell, in order to access to the subconscious and customer self-awareness. Today this method is considered obsolete, but the coloring shows many patients as an alternative to meditation, relaxation and soothing agent practice. Coloring helps a person to focus on the picture and the small details, throwing a few hours all of your obsessive thoughts and anxieties.