Great idea for a modular knit blanket. One simple shape makes a great quilt. Sidewalk Quilt by Pippa, an original design. Pattern available on her website and a similar version for sale in her Etsy shop.
Free Baby Quilt Tutorial: A Pink Classic @ Cluck Cluck Sew: After staring at fabrics for too long trying to decide what pattern to make my baby a quilt with…I went with classic hourglass blocks. There are probably loads of good tutorials for these blocks