Another grouping is Oreganos in various colorations; I love how tough they are, these are on a very dry ramp that gets almost no summer water-
My contribution to silvery is these small leaves of a Hebe pinguifolia 'Pagei'-
Another grouping of silver is this Hebe pimeleoides 'Quicksilver' with Santolina, accented by a Sarracenia leucophylla x rubra-
For some cool green with magenta highlights, a Cut-leaf Japanese Maple draped by a Schisandra vine-
Another combination of variegated Elaeagnus ebbingei and the burgundy tones of Berberis thunbergii-
And here with other plants added, a Nandina showing some fall color, a Bird's Nest Spruce, a weeping Mulberry, and some variegated Phalaris, which can overtake the weeds in a difficult area.
Enjoy your autumnal foliage, Hannah