You can recycle old bank cards, credit cards etc. by making guitar picks out of them!
I always lose my plectrums, so I can never have enough of them lying around. These plectrums are actually not so bad to use and if you can't find a real one, they're the next best thing.
Step 1: Materials
1 old bank card / credit card / any old plastic membership card, you get the idea.
1 pair of scissors.
Step 2: Cut Your Plectrums
Cut picks to desired shape/size as shown in picture. I can get at least 4 out of one card. First cut out rough shape, then trim to "fine-tune".
Step 3: Play!
start playing! (you can also use them for mandolin, uke, balalaika, saz, citar, banjo for my part...)