Base rnd, each side: Multiple of 2 + 1 + corner sts.
Begin in any stitch.
Rnd 1: Ch 1, sc in each sc around, placing 3 sc in each corner st, join with slip st to first sc.
Rnd 2: This round is worked with two separate balls of yarn: colorsA and B .With A, ch 1, sc in same st, ch 3, drop loop from hook; join B in next st, ch 1, sc in same st, ch 3, drop loop B from hook; *holding yarn tail and chain just worked to the front, pick up dropped A loop, sc in next sc, ch 3, drop loop from hook; holding yarn tail and chain just worked to the front, pick up dropped B loop, sc in next sc, ch 3, drop loop from hook; repeat from * around, end by joining each color to first sc of same color with slip st. Fasten off A and B.