This is basically a 2x2 ribbing which travels. There's some unusual shaping, but I don't think that this is a difficult pattern at all.
One modification if I knitted these again: I'd not knit such a long heel flap and I'd pick up my usual 16sts at the side of the flap, not 20 sts. Although the ribbing pulls in the sock, I like a tighter heel/ankle area.
Now pair 14 are on the needles, but unless I knit a sock tomorrow evening they're not going to be finished! I'm going to get off the computer and see if I can knit a leg tonight.
I don't want this pair on the needles after tomorrow as I have two new socks knitalongs, with monthly themes (more later when I choose yarn and patterns), and I'd like to catch up on the Debbie Abrahams Mystery blanket. Ooh, it will be strange to get back to my monthly lists!