Poo, $1.50 per bag

As people who are fond of spicy food know only too well, what goes in must come out. But what a boon it is when what comes out happens to serve a secondary purpose. This cannot be said for the poo of cats, dogs or people who are fond of spicy food, but by some magic of intestinal alchemy the poo of assorted farm animals helps our gardens grow. And to really drive home the point that this is recycling at its finest, old feed bags are often the packaging of choice. Also commonly available, if you keep your eyes peeled on your weekend drives and concern yourself with the journey as well as the destination, are lemons, pumpkins, small apples, fire wood and bags of mulch.