I built nunchaku (nunchucks) from plastic bags. The "chain" is made from twined fruit bags (the kind that you find on a roll in the produce department.) The handles are thermoformed shopping bags, which became very dense and hard when the many layers of plastic were laminated together.
I made the ends of the handles into two types of flowers: a rose on one side because this flower was originally printed on the shopping bags, and a ginger flower on the other side because I enjoy the form.
This isn't the huge project that I intended to make, but beginning progress on that looks like this:
It took me years to save all these colors!