The Picturesque tradition in landscape design has been a great inspiration. It can link sustainability with a powerful cultural style, which is essential in the effort to win over the middle class and eventually change norms toward accepting more biodiversity where most people live. More on the Picturesque. As I recall, 19th. century Gothic Revival and the rustication of architects like Richardson in America were considered Picturesque. As with so many things, a search on the web for some of the names above might add detail, clarity and accuracy to my halting recollections.
Preservation is key.
Old barns and other structures should be gently repaired and reused. Change to be incremental, always referring to and respecting the landscape which is to be changed. Waste is either recycled or made into art. And from what I hear about permaculture, lots of household waste that would normally go to landfill can simply be blanketed over the land to soften the earth and suppress weeds. It can also be integrated into cob construction perhaps.