Falkirk wheel is a good example as there is very little energy needed to turn it. Most of the movement comes from the weight of the top water tank being heavier than the bottom one. This pushes the wheel down.
Irn Bru glass bottles are another good example as they give the buyer the incentive to return the bottle to get 20p back. The bottles are then recycled, refilled and redistributed. If everyone did this no bottles would be needed again.