Excellent recycling. There may be other everyday items which could be re-used too .... I'm looking around the office but can't see anything at the moment. I'll look more thoughtfully at the next package I see.

JBMat and Art_In_Fl comments about laminate (I use laminate off cuts in the shed as a whiteboard/scratch pad)caused me to remember that, years ago, I made a diving slate out of PVC pipe.

I took a large diameter pipe (approx 90mm / 3inch) and cut a section about 90mm long. So now I had as small section of pipe. Then I cut the pipe into approx 3 vertical sections so i ended up with 3 curved sections of white PVC pipe. Finally attached some velcro straps to the top and bottom and I had an instant diving slate on a wrist band.