Chain multiples of 6, plus 2.

Row 1: In second ch from hook, work 1 sc. *Sk 2 chs, work 5 dc in next ch sp. Sk 2 chs, work 1 sc into the next ch. Repeat from * across, ending the row with 1 sc into the final ch. Ch 3, turn.
Row 2: In the first st, work 2 dc. *Sk 2 sts, then work 1 sc into the next st. Sk next 2 dc, then work 5 dc into the next sc. Repeat from * across, ending the row with 3 dc in the final st. ch 1, turn.
Row 3: In the first stitch, work 1 sc. *Sk 2 sts, then work 5 dc into the next sc. Sk 2 sts, then work 1 sc into the next st. Repeat from * across, ending with 1 sc into the top of the turning ch. Chain 3, turn.
Repeat rows 2 and 3.
Patterns using Shell Stitch
More Crochet Stitches to Learn