Sorry, Judy, but I have to disagree on a couple of points. Please
note that the high elevation sunlight of the continental western US
creates much different effects than are seen on the coasts, or in
locations where water vapor waters down color.

As I design gardens for myself and for others I've played with some
color combinations that might be considered unusual. Contrary to
Judy's statement that "A border entirely of equal amounts of true
blue and saturated orange is harsh," I've found that a border of
lavender, purple, bluish lavender mixed with bright yellow and
orange is together. I'm still playing with this border, but one
successful example is Scutellaria baicalensis with Happlopappus
croceus, two perennials with brightly-colored flowers and a
combination of which I have slides for a talk on use of native
plants in the garden.

Again, contrary to Judy's statement "Colors next to each other on
the color wheel relate harmoniously," I've found them to clash
horribly! For instance, red on the orange side clashes horribly with
red on the bluish side (e.g., Penstemon cardinalis and Penstemon
pinifolius), as does yellow on the golden side with yellow on the
golden side with true, buttercup, or sulfur yellow (e.g., Coreopsis
grandiflorus 'Sunray' and Achillea x 'Moonshine') On the other hand,
if I keep flowers in the range of golden yellow, orange, and scarlet
red, the resulting 'hot' border is spectacular.