This chart could be used for crocheting with color changes (intarsia) or for cross-stitch. The chart key shows numbers for the colors in three different embroidery floss brands. If doing cross-stitch on a background that was crocheted with size 10 cotton thread, embroidery floss can be used for doing for the cross-stitch. If doing cross-stitch with yarn on a single crochet or afghan stitch background, substitute similar yarn colors for doing the cross-stitch and use a large-eye (sewing) yarn needle (with an eye large enough for the yarn to thread through).
The chart is 31 squares wide and 31 rows tall. To crochet a background the same size as the chart, the starting chain is 32 chains for single crochet or 31 chains for afghan stitch. Make 31 rows. Crochet the background in a shade of dark aqua (this will be the color indicated as the symbol 1 on the chart) then work the rest of the colors in cross-stitch on the aqua background.