Most of my less formal socks are in a big upright clothes hamper - 100s and 100s of socks of just a few designs.
I root through it and find a pair when the need arises. It just seems easier than trying to pair them up out of the laundry.
An internal debate that occurs frequently during these sock diving sessions is when I can't quickly find two of a kind, so I consider just wearing two slightly mismatched socks (e.g. where the ribbing on the sock are slightly different sizes).
"But what if I'm invited to an unexpected Japanese tea ceremony?" I think, motivating myself to continue the search.
You think I'm joking, yet this is exactly the internal dialog that I had this morning.