Thank you everyone for all the sock comments, they're so much fun to read :-)
Claudia Handpainted Sock Yarn, Red Wagon.
I had actually planned to get the Pistachio, but this jumped into my cart instead. Sometimes, you choose the yarn, sometimes it chooses you.
And a buttony bonus, the last time I picked up thread I found these. I'm not really sure where I will use them, but something will come along soon enough.