These days color by number printables come in a variety of artistic forms. You could choose among a number of cartoon characters and/or pets, cars and so on and so forth. If your son or daughter likes Lilo and Stitch, without doubts, you can find a lot of colour by number pages with the characters of that cartoon.
However, it is important to understand that using a coloring book for adults is not exactly the same as completing an art therapy session. While art therapy was first practiced in the 1940s, the first research on using adult coloring pages as therapy is generally believed to have only begun as recently the mid-90s.
My boys bedroom is covered in his colorful works and it has been great to watch his development, especially his improvements in writing his name. He has really come on well and I know one day soon I will be packing them up and storing them in my memories box to remind me of happy times!