Scrappy Four Patch On Point Quilted Cushion

I've been working on a king size patchwork quilt recently.  One of the borders of the quilt is made up of four patch blocks on point (that is the blocks are set at an angle).  I generally make more blocks than are needed as a precaution.  With some of the leftover blocks I've made this envelope cushion and have added a binding in navy blue. 

The approximate measurements of the cushion cover are 20" x 20" or 51 cms x 51 cms.  

The cushion cover has been quilted in the ditch (in between the seams).  Between the layers is 100% cotton wadding.  This gives the cushion cover additional texture and a padded feel.

There is a mother of pearl button fastening on the back.  The cushion cover is machine washable (although care will need to be taken to protect the button).