We have joined Terracycle Writing Brigade.
We collect old biros,felt tip pens and board pens. We are about to post off our first collection,a 5kg box of used pens. Terracycle will donate 2p for every pen collected either to your school or a nominated charity.It has helped us learn about identifying different materials,about recycling plastic, and given us some good practice at weighing. I'll post some of the resources we have used but mean time check out the Terracycle website