After finishing the Sunday To to Meetin' Socks, I found I had a bit of the Koigu yarn remaining and it was an interesting complement to this yellow yarn. I like the way the delicate striping on the leg goes with the ruffle at the edge.
My brain is busy planning more sock patterns with complementary Koigu yarn accents.
Here's some great sock yarn I recently purchased. The pink is Koigu and the other is Louet Gems (machine washable and dryable) sock yarn.