"For a rectangle shaped quilt, you really need to have both the length & the width of the quilt divisible by the length of the repeat (that is, the repeat should end at exactly the same place whether you are laying it on the long or short side of your quilt). In that case, I would sew each border on individually. As this point, even if that was possible originally, I don't think it would be worth it to re-do the borders."
Thanks for explaining that Bree123! So if I understand correctly, you have to plan ahead when bordering out your quilt top to match the repeat in your chosen border fabric you want to match at the mitred corners when working with a rectangle. I'd have to think ahead.... It sure would be a stunning finish to have it work out!