LINK quote [Handmade guitar picks. Most are made from old plastic cards (gift cards, credit cards, hotel room keys, etc.) Other materials are cardboard, "Handi Snacks" stick, CD, Toshiba laptop, and plastic packaging. I trace a store bought pick with an ultra fine sharpie, cut them out with scissors (for plastic), and sand the edges with an emery board. The metal ones are more complicated].
(via Andy's Blog)