At Marlo’s Crochet Corner I eventually found instructions on how to cut a plastic bag to get the ‘yarn’ for crocheting and/or knitting. She also provides an instruction on how to crochet a tote.
Once I crocheted a purse with such yarn and it worked very well, but as always I didn’t take any photo ;-(
The purse was quite stiff (which I find appropriate for a purse ;-)).
I think about making plastic yarn (plarn) and working freeform with it, but I still have no idea what to make, because items knitted of crocheted with plastic bag yarn tend to get big.
Here at unikatissima: