Cast on 64 stitches with four strands of the main color. You will continue to crochet with four strands of cotton throughout the rug pattern.
Rows 1 to 10: Single crochet into the second chain from the hook and continue to single crochet in each of the following chain stitches to the end of the row. Chain 1 and turn the work. You should have 63 single crochet stitches.
Row 11: Single crochet 3 stitches then switch to the contrasting color. Single crochet 40 stitches. Change back to the main color and single crochet 21 stitches. Chain 1 and turn the work.
Row 12: Single crochet 20 stitches with the main color. Change to the contrasting color and single crochet 41 stitches. Switch back to the main color and single crochet 3 stitches. Chain 1 and turn the work.
Row 13: Single crochet 3 stitches with the main color. Change to the contrasting color and single crochet 42 stitches. Switch to the main color and single crochet 19 stitches. Chain 1 and turn the work.
Row 14: Single crochet 17 stitches with the main color. Change to the contrasting color and single crochet 44 stitches. Switch to the main color and single crochet the next 3 stitches. Chain 1 and turn your work.
Row 15: Single crochet 3 stitches, using the main color. Change to the contrasting color and single crochet 45 stitches. Change back to the main color for the next 16 single crochets. Chain 1 and turn the work.
Row 16: Single crochet 16 stitches with the main color. Switch to the contrasting color and single crochet 45 stitches. Change back to the main color and single crochet 3 stitches. Chain 1 and turn the work.
Row 17: Single crochet 3 stitches with the main color. Change to the contrasting color and single crochet 45 stitches. Switch to the main color and single crochet 3 stitches. Chain 1 and turn the work.
Row 18: Single crochet 18 stitches with the main color. Change to the contrasting color and single crochet 45 stitches. Switch back to the main color and single crochet 3 stitches. Chain 1 and turn the work.
Row 19: Single crochet 3 stitches with the main color. Change to the contrasting color and single crochet 46 stitches. Switch back to the main color and single crochet 15 stitches. Chain 1 and turn the work.
Row 20: Single crochet 13 stitches with the main color. Change to the contrasting color and single crochet 48 stitches. Change back to the main color and single crochet 3 stitches. Chain 1 and turn the work.
Row 21: Single crochet 3 stitches with the main color. Change to the contrasting color and single crochet 48 stitches. Change back to the main color and single crochet 13 stitches. Chain 1 and turn the work.
Row 22: Single crochet 13 stitches with the main color. Change to the contrasting color and single crochet 48 stitches. Change back to the main color and single crochet 3 stitches. Chain 1 and turn the work.
Row 23: Single crochet 3 stitches with the main color. Change to the contrasting color and single crochet 59 stitches. Switch back to the main color and single crochet 12 stitches. Chain 1 and turn the work.
Row 24: Single crochet 10 stitches with the main color. Change to the contrasting color and single crochet 51 stitches. Change back to the main color and single crochet 3 stitches. Chain 1 and turn the work.
Row 25: Single crochet 3 stitches with the main color. Change to the contrasting color and single crochet 55 stitches. Change back to the main color and single crochet 6 stitches. Chain 1 and turn the work.
Row 26: Single crochet 3 stitches with the main color. Change to the contrasting color and single crochet 58 stitches. Switch back to the main color and single crochet 3 stitches. Chain 1 and turn the work.
Row 27: Single crochet 3 stitches with the main color. Change to the contrasting color and single crochet 55 stitches. Change back to the main color and single crochet 6 stitches. Chain 1 and turn the work.
Row 28: Single crochet 10 stitches with the main color. Change to the contrasting color and single crochet 51 stitches. Change back to the main color and single crochet 3 stitches. Chain 1 and turn the work.
Row 29: Single crochet 3 stitches with the main color. Change to the contrasting color and single crochet 59 stitches. Switch back to the main color and single crochet 12 stitches. Chain 1 and turn the work.
Row 30: Single crochet 13 stitches with the main color. Change to the contrasting color and single crochet 48 stitches. Change back to the main color and single crochet 3 stitches. Chain 1 and turn the work.
Row 31: Single crochet 3 stitches with the main color. Change to the contrasting color and single crochet 48 stitches. Change back to the main color and single crochet 13 stitches. Chain 1 and turn the work.
Row 32: Single crochet 13 stitches with the main color. Change to the contrasting color and single crochet 48 stitches. Change back to the main color and single crochet 3 stitches. Chain 1 and turn the work.
Row 33: Same as Row 19
Row 34: Same as Row 16
Row 35: Same as Row17
Row 36: Same as Row16
Row 37: Same as Row 17
Row 38: Same as Row 14
Row 39: Same as Row 13
Row 40: Same as Row12
Row 41: Same as Row 11
Rows 42 to 51: Single crochet across the row with the main color. Finish off the row with a slipstitch.
Join the contrasting color with a slipstitch to the top left corner. Single crochet in each of the stitches across the top of the rug.
Single crochet 3 stitches in the corner and in each consecutive corner of the rug. The 3 stitches gives you a square corner as you proceed crocheting down the side of the rug.
Continue to single crochet around the four sides of the rug. Join to the top left corner with a slipstitch and turn the work.
Chain 1 and single crochet in the same way as the previous row around the rug. You now have two rows of the main color. You can add extra rows by following the same instructions for the edges.
Change to the main color and follow the edging instructions for two more rounds. Finish off with a slipstitch, connecting the final corner of the rug.