After years of experimenting with Styrofoam, this is one of the best results I've got so far.
To make this necklaces I used home appliance packaging (white and black) from the electronics retailer: Media Markt.
The material reduces 90% its volumen while recycling, so it takes a while until your able to get the final piece! I would say, at least 3 to 4 times longer than any other hard plastic.
This is one shape of nacklace and you can find the other alternative in this link (also for 25 €):
Also earings made with silver hooks for 30 €:
AND we have a pair of earings + necklace for 50 €! here:
Ask for the colours available!
-> Domestic shipping for 5 €: All European Union
-> For the rest of the world ask for a proper quote ;-)