What a lovely idea. The couple will share in a ceremony sheltered by the good wishes of their friends and family. I recently made a quilt for the DD of very good friends. On the binding I machine embroidered sayings about love. One was from their wedding invitation--The Chosen of his heart is the Chosen of her heart. But the one I found that really resonated with me was: The most precious gift we can give costs nothing. It is called Love.
Find a saying or sentiment (or make one of your own) and write it on the fabric with the marker suggested above. It will be cherished.