Fold a piece of felt so that there is enough room for a card inside the case, leaving an inch or so of extra on the end to fold over as the flap.
Stitch up the sides using the blanket stitch. You can find instructions here
Cut a button hole in the flap. Attach a button, lining it up with the hole.
Cut out a Snitch and wings. Attach using the blanket stitch.
Add a small loop of ribbon or a key ring to one side if you'd like.
© Backstgartist's pattern was taken with permission, and may be reached by e-mail.