Being a crazy person, I think I would cut a 5 or 6 inch strip off the width of the quilt and insert 6 inches of a red gingham, or a solid 'reading' red or blue print between the strip you cut off the quilt and the rest of the quilt.

But I like my quilts longer and wide!

No matter what you do with this quilt, it will be fabulous. How do I know that? It already looks fabulous!!!

How do you intend to use this quilt? I generally make quilts 1:1.3 but mattresses keep getting thicker and you have to accommodate that in today's measurements. Beds use to be much narrower. I just measure whatever bed I want to fit or a wall space if I am making a wall hanging. It's your thing so do what you want to do.