Aubretia 'Purple Cascade' in various shades of purple - hardy, low spreading, blooms April to June, full sun, semi-evergreen, prune to keep from getting leggy
Creeping Thyme is the ideal groundcover for the gardener that wants it all – utility, color, and even a lemony fragrance! A diminutive flower that grows usually no more than ½ a foot tall, Creeping Thyme is the ultimate low-maintenance perennial.
From Monet's Garden at the New York Botanical Garden: Delphiniums, foxgloves, roses, hydrangeas, peonies, tulips, a sensuous abundance of flowers, colors, fragrances.
White Clips Bell Flower - gorgeous, their slight translucency reminds me of jelly fish floating in the water
For a more romantic look, combine cottage garden favorites, such as fragrant catmint (Nepeta sp) with perennial sage (Salvia sp). Their mounding forms are punctuated here by spheres of lilac alliums, held aloft on sturdy stems. This is a great drought-tolerant summer trio for full sun.
Beautiful rock garden
Tulips and pansies with shrub borders. Great companion plants.