are you looking for flowers or for shrubs?

I would suggest perennials, a combination of those with attractive foliage and flowers. Daylilies are great and easy, lambs ears, Chrysanthemum 'Becky' (white daisy flowers) and if you want a shrub or two, Hydrangea paniculata 'Limelight' is easy. Low sedums for groundcover.

One more perennial, Arkansas Bluestar, (Amsonia hubrichtii), pale blue flowers in spring, green willow like foliage all summer and yellow fall color.

Tough and beautiful.

How about a Dwarf Nandina mixed in for some year round leaf interest. I love the new variety named 'Obession' maybe paired with some Dwarf Grasse like Hamln and some ground cover Sedum, Ice Plant or Dianthus in the front. You could also add in some wonderful Red Hot Poker Plant! Or some of the new coneflowers with some really awesome colors. Or some candy tuft,...OK I am stopping now! :)