I agree, absolutely lovely.
I like the all white flower idea because it should serve as a neutral backdrop, but then it might be monotonous. Depending on how large the beds would be, could you place pastels on the ends and gradually fade them toward the house until there is only white? That is assuming the beds run parallel to the house. If out in that middle grassy section, maybe you could take a similar approach, only from one side of a circle to another, or white in front gradually changing to pastels in back, as an examples.
