What things are always green?
Chlorophyl and anything casting an image in the infra-red spectrum. These are just a few.
I am not really sure about the question. Greening in general can mean doing/using something in changing your lifestyle to a more environmentally friendly way. It is as simple as swapping out your household products to Green cleaners. I always buy green and use green. This is where I always get bulk green cleaners: agreensupply.com