Creating an artificial constraint can be a very effective tool in obtaining your sustainability goals. For example if you have ever gone backpacking there is always this struggle when evaluating what to pack. It is much different than car camping where you can bring almost anything you want. When backpacking there is a very clear cost tradeoff between packing too many comfort items and how much weight you are willing to lug.
In most cases the cost of your company's impact to the environment isn't obvious, so to help create awareness why not create artificial constraints? Why not have more recycling cans than garbage cans? Why not reduce the number of printers? Why not get rid of disposable plates and silverware? Why not at least create some friction for the areas that have the greatest negative impact on the environment?
As an experiment I switched the trash portion of my weekly home garbage pickup to a system that I pay for each bag I dispose of instead of one bin a week. It took me a while on the phone with the local Western Disposal garbage representative to determine if I could use the extra paid garbage bags as my only trash disposal mechanism but in the end several managers within earshot agreed to my scheme. Turns out I was more careful of what I was throwing away because I had very limited space. Even though I recycled and composted I didn't think about what I was disposing of because I always had extra room in the trash can. Now I only throw away a 32 gallon bag of trash once every three weeks instead of once a week.
The easiest place to start would be the number of trash bins or frequency of trash service. Cut it in half and see if the constraint results in a reduction of trash. In Boulder the most conscious companies of all types are now diverting over 92% of their waste. I bet eco-conscious companies don't have really big trash cans littered throughout their office!