I also have Trailing Lavender Lantana planted at the base of my Julia Child and Pope John Paul II roses. It covers a lot of ground, is easy to break off if too encroaching, looks pretty, and smells good, too. Here it is with a deeply clipped PJPII. I marked the trailers so you can see how it weaves in and out of the rose shrub, Mexican Heather, May Night Salvia, Asclepias Tuberosa, Parrot Glads, and even a little bit in the Amethyst in Snow Centaurea to the far upper left.
