What you need:
Old credit cards or Gift Cards (for thin picks)
Old Cds (for thick picks)
Nail Polish (optional)
Guitar Pick (for reference)
(i) Trace original guitar pick on Gift card. You could fit about 5 picks on each card.
(ii) Cut out each pick.
(iii) File edges and you're done!
(ib) Trace original pick on an old CD. You can fit about ten picks on a CD.
(iib) Cut out each pick. This could be hard depending on your scissors.
(iiib) Peel off data foil from each cut out till each pick is see-through.
(ivb) File edges and you're done!
(optional) Coat each side of your picks with nail polish and let dry. Not at the same time though. Don't be stupid.
Note: You can make your own shapes too :]