A brightly lit office with natural daylight does wonders. The presence of plants to balance, improve the air quality as you've mentioned, and absorb electronic radiation emitted by gadgets and electronic equipment.

I watched this documentary whose title I forgot the other night about calculating the carbon footprint. Recycling and upcycling were highlighted. It now makes me think about which items we could creatively use to recycle and upcycle to be used in the office? Good point about attention to mindful use of paper