This is a twist on the old standard Feather and Fan. Slipped stitches provide the strands that are later picked up to form the sides of the windows.

The afghan can be made with most yarns and appropriate needles for the yarn. The example is made with Caron Simply Soft yarn and size 8 (5mm) needles.

Example is a 37 inch square lap blanket, but pattern can be easily modified to make any size.