Most of the color in my little garden now comes from members of the
Compositae Asteraceae, such as the Tithonia above. That one is at the red end of the color range; most are more orange.
Zinnias may be coarse and common, but I can’t think of any other genus that supplies as much color with as little trouble and expense.
I expected the California poppies to fade out after a month like other hardy annuals, but they’ve kept going. It looks like they’ll continue indefinitely. Aside from them, though, everything left in the garden now are all composites.