Oh, m'lady ~ That was the birth of the coverlet (when the full size didn't work out), then the twin, and the crib size. When things really went awry, we invented lap robes. If those got a little wonky, we called them wall hangings. And who could imagine the humble beginnings of a table runner?
Just change the size and repurpose it, throw on another border (or take one off). But whatever you do, stay with it and enjoy your entirely new creation.
So many beauties are borne of adapting an error, ending up so much prettier than originally planned. Not to worry.
And now I'm standing - to applaud your effort. Go girl!