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.
Plant an all white flower garden and the flowers glow in the moonlight. Dressed in White White forget-me-nots, tulips, daisies and money plant combine with hostas and silvery astelia foliage in this spring garden.