love blues / purples in the the garden!

Lavender flowers in a garden border with green background and old brick path for contrast.

meadow terrace - Google Search

Mixed fountain grasses plus pee gee hydrangea, white echinacea ("White Swan"), plus possibly some oak leaf or Annabelle, plus possibly low white carpet rose. Maybe add Icicle White Veronica or similar. Do Russian sage and grasses near steps.