I was at college this last weekend. Our classroom is in a five star conference centre in a country house in Buckinghamshire. Between lessons we enjoyed coffee and tea from vending machines. I suddenly noticed the shape of these paper cups was just perfect for re-using as root trainers! So I announced to the rest of the class that I would like all their empty cups to use as root trainers. Expecting a bit of a titter and some teasing.... but nothing! As the weekend went by, more and more paper cups appeared on my desk, without a word and willingly, and with smiles!