pattern for this can be found at Haken en Meer (just translate it from the Dutch). It’s basically AWESOME. Looks like a granny stitch but with a small stitch in between. Loving it so much that it’s going on my to-do-sooner-rather-than-later list.
Crochet - Granny Spike Stitch - leaves fewer gaps, because the second double crochet is crochet through the top of the second double crochet of the row below. Possibly use a dc,tc, dc pattern in the clusters? From Do It Darling.