Before you take the blocks apart, why not try laying strips of the extra wide rick rack down between the rows of roses and see how that looks? It could look really nice, and if you disliked it, nothing is lost.All you would have to do then, is sew down the rick rack on both edges of the tape and add a border before you start quilting. I'm of the opinion that something like this will enhance the cross stitch.
I would try the colour of dusty rose first and I believe Moda makes the rick rack. It would be a good way to trial the colours first, even if you didn't go with the rick rack.