Between the Lines by Mountainpeek Creations
http://www.thequiltpatch.com/between-the-lines.html
or this pattern by Kaufman - Box Trot
http://www.robertkaufman.com/quiltin..._Trot/#color:1
or free pattern - Lumina Dawn by Kaufman -
http://www.robertkaufman.com/quiltin..._Size/#color:1
Note: to me, the Lumina Dawn looks like it needs the darker gray around the large print strips. But, that's just me.