An oldie but a goodie: Green Island by tag, IMKW, and immr in Japan. I've actually had dreams along these lines, where all the asphalt of the city was replaced by fields of green. In my dreams people would drift race like maniacs on the slippery grass to wherever they were going, the smell of freshly muddled sod in the air. Really fun, actually.
These fantastic, outrageous visualizations are the next best thing to dreams. It's amazing how green grass brings an instant sense of calm to a normally chaotic scene. The creators behind Green Island don't do many of these, but when they do they're always impeccably detailed + stunning. They've even branched out to France, Vietnam, and right here in US, in Las Vegas:
Brilliant stuff. Of course it's not meant to be taken realistically — it's meant to get people thinking + talking, and it does so in a beautifully paradoxical, pastoral way. Check out more.