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.
The Porch Rail pattern is another popular 3 yard quilt from Fabric Cafe. This x 60 inch quilt is a great gift quilt for veterans. Easily made in 6 to 8 hours, this pattern has all the instructions for cutting and assembly of the quilt top.