Imaging equipment: are 40% more efficient than standard models. Multi-purpose equipment (ex. combined printer, scanner, and fax machine) are much more energy efficient than many separate machines.
Skip the disposable cups. Bring in an interesting mug and you’ll always know which coffee is yours. Encourage your colleagues to as well.
Avoid using the elevator and take the stairs instead. This gives you some exercise while conserving energy.
Keep air vents clear of paper, files, and office supplies.
Keep documents electronically rather than printed copies. Computer files instead of paper files mean easier searches, organization, and a less cluttered workspace.