The pattern is called, "Shrimp. Sock. Love."
It was made using Suripaco's Springvale Collection. I bought it while I was in Southern Maine this summer. It's a local, Maine-made wool/alpaca/silk blended yarn. Every yarn store I went to in Maine carried Springvale Collection, but for "Shrimp. Sock. Love." you can use any heavy-ish fingering/4ply yarn, as long as you have 50g of each color (main and contrasting).
I will release the pattern once the shrimp chart is edited. :)