Hi, when I was a young lad, we used to run around collection old crisp packets and plastic carrier bags.
Then we would heat this to a low to medium temperature (this was done via a boiler outlet pipe, we laid them on the grill and watch then either shrink or would leave them longer so we could mould them into a shape).

Therefore with all these tree hugging environmentalists now running around, would it not be possible to collect old plastic carrier bags then subject them to a small amount of heat, (either a hot hairdryer or an electric heated paint stripper would do) then mould plastic figures and other plastic hand made moulded items out of them?

Well just a thought from when I was a lad.
Thanks for your time, from Vince.