If you dive into the world of native plants, you will find a lot of interesting and showy plants in your area. The US is filled with them, no matter the zone you're in.
A close relative to the Wild Columbine I posted is native to your area. Crimson Columbine (Aquilegia formosa).
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You also have Showy Milkweed (Asclepias speciosa), which is highly popular due to it's interesting flower shape and color.
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Blue-eyed Grass (Sisyrinchium bellum) is also a great native in your area, I grow a similar specie and it's one of my favorites.
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Azure Penstemon (Penstemon azureus) and Small Penstemon (Penstemon parvulus) are natives that I wish I had in my own area. They're too damn cool.
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(All photos above are from various online sources)
That's what I found after a quick search, but I'm sure there's many more, Of course, plants that aren't native to your area, but are US natives, like Long-headed Coneflower and Orange Milkweed would likely do just fine in your area, too.
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