White clethra and red cardinal flower look rather nice together: gorgeous ivory and red spires.

Joe Pye and Goldenrod: old rose and gold

Cardinal flower (blue and red), Black Eyed Susans, Coneflower, Shasta Daisy: white, blue, red, gold, with just a bit of dusty pink

Phlox against the trees: all the shades of pink, plus pure white

The last few flashes of orange daylilies, white oriental lilies

Burgundy coleus and silver leaved Rose Campion

and so forth

August, unlike July, gives one some wonderful days: no humidity, blue skies, full of life.