Chain a multiple of 6 + 3 ch
Row 1: In sixth ch from hook 5dc, *[skip 2ch 1dc in next ch, skip 2ch 5dc in next ch], repeat from * to last 3ch, dc in last ch, ch3 and turn.
Row 2: *[Work 5dc in third dc from hook (top of 5dc cluster), skip 2dc and dc in dc], repeat from * to end of row dc in last dc, ch3 and turn.
Repeat row 2 for pattern.
To add more texture and depth to this pattern, you may want to consider the raised stacked shell stitch pattern.