Paper is something that every office goes through a large amount of. Printing things double sided could reduce the amount of paper used as well as making sure that people are not printing things and then leaving them at the printer just to be thrown in the bin. Look at what can be reused in your office and what can be reduced in usage or quantity. E.g. cardboard boxes, stationery, IT equipment like memory sticks. Provide different recycling options and grow them over time. The options can grow from just paper and card to glass plastic, print cartridges, etc. They should also be spread around the office so that people do not have an excuse not to use them!