While I try to pull together the next longer post, here is another picture from the Michigan garden, featuring once again the leopard lily (Belamcanda chinensis) as well as purple coneflower (Echinacea purpurea), black-eyed Susan (Rudbeckia fulgida var. sullivantii 'Goldsturm'), and Russian sage (Perovskia atriplicifolia).
I like the way the leopard lilies burst out over the black-eyed Susans; that might be an effect worth trying with other perennials
I think the color combinations worked out relatively well for being more or less accidental. Maybe I should plant some more leopard lilies; there is not currently much orange in the garden.