I've found an interesting article:How To Create Easy Crochet Picture Afghans by A GrafCreating picture afghans are made most of the time using a Tunisian Simple stitch. You can find Tunisian crochet tutorials at http://www.stitchdiva.com/custom.aspx?id=40 With a published graph or a few simple graph-making tools, yarn in a variety of colors, and easy Tunisian crochet hooks, you'll be on your way