Lovely purple and blue planting plan. Allium giganteum (Allium 'Globemaster'), steppe sage (Salvia memorosa 'Caradonna'), catmint (Nepeta x faassenii 'Walkers Low') and peat reed grass (Calamagrostis x acutiflora 'Karl Foerster').
Consider adding a living path to your landscape. Many mat-forming plants are also tough enough to tolerate light foot traffic.
Cheery Repose — A collection of water-hardy plants, including lavender, catmint, goat's beard, and lady's mantle; all require minimal water to reach maximum growth.