Big Bud Press has incredible socks. both thick and thin - I like the thin best, for wearing in loafers, vans, tighter sneakers or boots. They also have thicker ones that are great for sneakers and bigger boots. All cotton, many colors.
Stay Forever is a gift store in Ridgewood, Queens that has novelty socks with cool color combos that I love. No idea if they make them themselves or where they get them but they are so cute