Some beautiful color combinations:
Top-left. Contrasted against the house, is Common Ironweed, Vernonia fasciculata, a tall plant that likes it kind of wet.
Immediately in front of it (actually about 15 feet away) are the purple spikes of Prairie Blazing Star, Liatris pycnostachya, a real butterfly magnet.
In the center of the photo, from left to right, is a large clump of Canada Wild Rye, Elymus canadensis. To the right are the yellow badmitton shuttlecock-like flowers of Yellow Coneflower, Ratibida pinnata.