Filoli is kind of known for those formal English style gardens, but there are plenty of ideas for us lazy gardeners, too. Everything in this border is low maintenance and drought tolerant. No deadheading, pruning, or cutting things back. And the foliage mix here is so good that even after most things are done blooming, the garden is still totally stunning.
Repetition of purple-black shrubs as a transition between the trees and the low growing perennials at the front of the border.
Black and silver. Berggarten Sage (Salvia officinalis ‘Berggarten’) and purple smoke bush (Cotinus coggygria). In a smaller space you could use Loropetalum chinense ‘Purple Diamond’
Ceratostigma plumbaginoides. This was growing all over the place. It just flows in around everything and gives you a low dense mass of green with the most intense blue flowers.
More useful stuff: