Amazing, even more beautiful than the last time you posted a picture! I thought to make the simple borders they ask for that by comparison you would be grateful for their ease. How about using every color in your quilt placed exactly under that square? Not sure how big your blocks are but would mean tons of cutting, joining and piecing for your border.
You can and will do whatever you wish with your skills no matter how burned out you will err on the side of beauty.
Thank you.