Chain a multiple of 7 + 4 ch
Row 1: 1dc in fourth ch from hook, skip 2dc and 5dc in next ch, *[skip 2ch 1dc in each of the next 2 chs, skip 2ch 5dc in next ch], repeat from * to last 4ch, dc in each of the last 2ch's, ch3 and turn.
Row 2: 1dc in next dc, *[skip 2dc, 5dc in next dc (top of 5dc cluster), skip 2dc, and 1dc in each of the next 2dc's], repeat from * to end of row dc in each of the last 2 dc's, ch3 and turn.
Repeat row 2 for pattern.
To add more texture and depth to this pattern, you may want to consider the raised double post stacked shell stitch pattern.