I have dark ash blonde hair that's going silver (kind of a bright, light gray) and I love wearing pewter and silver shoes to add a bit of interest to my laid-back smart casual looks.
The Taos sneakers below are go-to with black slacks or jeans and a top that's muted, rather than bright. When I wear bright tops, I tend to wear black shoes, or leopard, to highlight the bright and that I'm just snapping with color that day. My pewter shoes are more subtle and so I pair them with softer tops.
I have no idea if what I'm doing has any fashion logic. I just like how it looks.