Here is a list of blogs on sustainable futures:
Imagine a world with no money: This blog has a vision of a new kind of society
The Ecotopia 2121 Project sets out to artistically present 100 cities throughout the world as they would appear in the year 2121 — if they’ve managed to survive and become super eco-friendly. ecotopia2121.com
Climate Optimist shares examples of how people all over the world are solving climate change.
You could take any genre or story you like (crime, romance, children’s, comedy, tragedy, drama, adventurer, thriller etc.) and simply set it in a world where there is no money – see the imagine no possessions blog for some ideas on how such a world might function.