I think we were the last people in the universe to buy a queen mattress. Consequently a lot of my quilts are double size. I ripped an old sheet in fours and added a length to the end of my double quilts.
I've also turned them sideways for the length to be the drop and add the sheet to one side.
I'm doing my first quilt as you go, which is going pretty well, and am now thinking of making long slim quilts to attach to those doubles.