I've written about combining plants for texture before, because adding textural contrasts will add interest to the garden even when the given plants aren't in bloom. The textural contrasts get amped up a notch in fall when colours start to change to fiery reddish-oranges through to bright golden yellows. Aren't you just loving fall this year? Especially since we didn't get one at all last year (the green leaves just froze on the trees/shrubs/perennials early last October, remember?) The golden, spiky foliage of daylilies can be seen in the front of the photo above.
More photos, clockwise from top left: echinacea 'Magnus', nepeta 'Walker's Low", shasta daisies and sedum 'Autumn Joy' in bloom; daylily foliage in front of ornamental grass 'Karl Foerster' and a juniper; red spirea 'Goldflame' foliage and a purple sedum; the more established side of the front welcome garden.