Between the hosts along the entry walkway? Purple Flowering Groundcover -Campanula Portenschlagiana - a plant that grows in less-than-ideal conditions and has long-lasting foliage. Plant care info is on the post - via Northern Shade
DIY - Glow in the dark pots with mums for fall/Halloween. Buy a flower pot that you really like and use Rustoleum's Glow-in-the-dark paint to paint the pot. During the day, the paint will absorb the sunlight and at night the pots will glow.
Black green and white. This garden was created by Ludo Dierckx , Belgian landscape for a client of Rotterdam, the Netherlands. The use of white flowers , along with lavender and buxinhos convey elegance to the design.