I agree, the color are great, your Grandma will love and appreciate all of the time that you put in it. Another idea would be to use the squares in a table runner, cut apart and sewn back together in a wacky quilt, a background for an art quilt many many ideas come to mind. Just keep at it you are on the right track.
And yes I have one quilt from hell hiding in my closet, someday someday just maybe I will re-visit it. lol