I'm the guy who paid $80 apiece for a pair of Hemerocallis 'Red Suspenders', which is a red/yellow bicolored daylily with eleven-inch flowers.
You read right: Eleven inches. (I paid $80 apiece for two of anything named 'Red Suspenders'.) So I can't be criticized as being one of those garden sophisticates for whom Flowers are a bad F-word, but Foliage and Form are good.
And good they are, filling out and brightening up the garden so flowers don't have to do all the work. Here's a dwarf Japanese maple, Acer palmatum 'Red Pygmy'.
Ferny foliage that says purple all season, and a low and starting-to-worry-me-it's-getting-so-wide habit. Fine and dandy in itself. But then with the variegated gooseneck, Lysimachia 'Geisha' pushing up at the front edges?
The yellow and green leaves are humming a jazzy but harmonious tune indeed atop the foreground of the Red Pygmy's tasteful dark ostinato of "ferny-purple-low, ferny-purple-low".
And Geisha has the typical gooseneck flowers, whose nodding soft-white cones are an echo to Red Pygmy's nodding ferny-purple-lowness. Vertical spikes of flowers would be too disruptive.
All in all, a lot going on, all of it riffing together. This plant combination has rhythm as well as harmony, self-evidence as well as second-glance subtlety. Yum!

If Giacometti had designed perennials instead of sculpture,
this would be one of his greatest:
Asian burnet is so distinctive, to elongatedly elegant, that I have it right by the path to my back door: It's a star, worthy of such prime real estate. Strong straight-arrow, nearly leafless flower stems shoot up almost five feet.
They filigree the foreground, so are the perfect front detail to embellish long-distance views.
The leaves themselves are almost all at the base, and they are a narrow ferny bunch. (The latin is Sanguisorba tenuifolia, where tenuifolia means, literally, "narrow leaves". Think "tenui" like "tenuous" or "attenuated": all mean, one way or another, narrow, thin, stretched.)

The quirky pendant bottle-brush flowers are the Dr. Seuss touch.
Intriguing and even comical, they are the dancing levity atop all this startlingly-severe and anorexic geometry.
Normally in burgundy, pink, or red, this white-flowered form keeps elegance at least in coloring if not in habit. As with all the burnets, tangential pollinators like flies and small wasps are the chosen few, not the usual mainstream bees. Even here, then, the perennial is proud in its iconoclasm.