Those are so pretty, Val! I really love those, do they stay fairly small?
I think variety of overall shapes, sizes, and textures is the most important thing to keep in mind. A balanced combination of broadleaf and coniferous shrubs along with blooming and deciduous shrubs and ornamental grasses are some of the prettiest gardens I've seen.
Val, do you have some pics of the yard where you're thinking of adding some? That would be great to see, and will spawn ideas.