21 Crochet Patterns for Blankets. Readers can explore a fresh collection of 21 crochet afghan patterns! Back by popular demand, this updated edition of the Big Book of Crochet Afghans showcases all new modern crochet patterns. These unique designs feature a variety of techniques and styles including granny squares, reversible afghans, open lace stitch, solid stitches and more. Crafters will find crochet blanket patterns madeusing DK-weight and worsted-weight yarn.