Reuse an expired credit or empty gift card to make a guitar pick instead of buying a brand new pick. You will need a pick, nail file (or sandpaper), card, and sharp scissors. Each card will probably yield about four or five picks. With a pen or Sharpie, outline your pick onto the card, centering it around whatever design or logo you want on the pick. Then, cut out this shape with your scissors. With the file, go back and file down the edges so that they are smooth, making sure that all sides are smooth and even. You don't want the pick snagging on your guitar strings.