With an elaborate inspiration story and an intricate lace pattern (spread across four charts!), the Vallmo sock (on Ravelry) is arresting. It is knit at a teeny-tiny gauge, like most sock patterns, and it is knit from the top down (not my preferred way, but I'll do it for a pattern I really like), but there are three size options (always nice). It's written for yarn from an indie dyer on Etsy, or you can easily substitute nearly any other sock yarn. I'd stick with a solid, light colour, so the lace pattern will shine.
Images by Spinning Yarns Designs