However, at some point during our meeting with our florist, it was decided that she would create a sash with a fresh floral detail for my sister's bridesmaid dress. I loved this idea because it would then be guaranteed to coordinate with her bouquet, and not be too "busy".
I think it will ultimately look the most like the first photo, though I wanted to throw in the other ones for your viewing pleasure.
Did you consider using fresh flowers as an accessory?