Cool!

Although I don't use picks much on banjo or guitar, I used to make cheap-yankee picks out of milk jugs, (light) Laundry Detergent jugs (medium) and credit cards (heavy). I thought it was pretty cute to cut a pick around my name on the credit card; gave it kind of a personal, customized touch, ye know.

They worked pretty well for a while, but I found that they don't stand up to the constant flexing as well as the store-bought ones do.
Of course the price is right, and it's a novel form of recycling.

Trash-picks are OK for practice, but I would reccomend sticking with the "real" variety when performing in public, so as to avoid the embarassment of having one the recycled jobs bust in two on you in the middle of a lick, as they are rather wont to do.

Some smart-Aleks build up their nails with super-glue, or coat the tips of their fretting fingers with it to protect them while doing a lot of slides or fancy fretwork on steel strings. Sort of like synthetic callouses.   Just wait for it to dry all the way 'afore playing, won't you? };^{)~