I made the first one of these while in India. The Darwin Day KAL (Knit-A-Long) over in the Ravelry AAC group provided the impetus to overcome second sock syndrome.
The yarn is handspun British yarn from a seller on Etsy. Etsy is a great arena for crafters and I can lose hours there browsing the beautiful hand made items.
My yarn is from Shunklies, a UK spinner. I used 2.5mm bamboo DPNs to knit the socks. The pattern is called Monkey.