Start with 3 colors. Each block is 9 stitches so for however wide you want the blanket, count in 9 to get your foundation (always make it an uneven number of "blocks) eg: 19 blocks(makes it about long) stitches then add 4 sc for the foundation row.
Easy blanket stitch -- This easy stitch is perfect for an afghan or blanket. It is just sets of 3 stitches, one single crochet and two doubles. Use it for a baby blanket in a pretty pink or blue or for a regular afghan with bright colors!