Two Grey Hills is a traditional pattern for an Indian rug. (There are fine examples of Indian rugs here, and then I found several Two Gray Hill rugs here.) J.Michelle Watts has adapted the rug to a pieced quilt pattern; it is found here. A friend pieced it and asked me to quilt it.
Here it is;
My other blog will have close-ups. Here. If you study it well you will see where I let the evil spirit out of the 'rug,' a well honored Indian rug tradition that is mentioned here.