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.
Add the finishing touch to any blanket with any one of these Quick and Easy Crocheted Blanket Edging Patterns. There are three easy crochet patterns to choose from. You could even add these edgings to any simple fleece, flannel, or receiving blanket.