I found this pre-sketched, framed canvas at Michaels Crafts-http://www.michaels.com/art/online/home . It is made by Creatology and cost $3.00. It comes with four colors of acrylic paints and a plastic brush. If you are going to paint it, get a new brush. My suggestion is to use markers.
The picture shows the blank canvas next to the one I colored. The trick here is to let yourself go and put pattern (checks, lines, squiggles) in the separate areas, instead of just coloring. The other trick is to outline the sections so that you do not see the lines.This is very easy and very relaxing. And when you are done, you have a hang-able piece of art.