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.
lace pattern with chart motif dentelle avec grille
An interesting stitch pattern. Not in English, but it is a stitch chart that looks easy to figure out.