House of Cheviot offers marled/speckled hose in a few different lines: Hebridean (made for those with larger calves), Sheltand, and Reiver. Looking at their image of the Reiver Autumn Glow sock, you can really see the two colors in the yarn.

https://www.houseofcheviot.com/media...utumn_glow.jpg

https://www.houseofcheviot.com/gents/kilt-socks

Andrew