Ruins are hard to do convincingly in LEGO form. I think this is partly to do with the rigid grid of the brick, which does not lend itself to organic shapes of decay, and partly to do with the visual incoherence that often results from too many shapes and colors in the same visual field. Even though we are a far cry from the primary/white/black color days at the dawn of the LEGO brick, there is still a limit to the shades and hues that can be used to differentiate areas of a build and maintain something that still makes sense to the brain. That being said, this post-apocalyptic build by Peter Ilmrud does a good job of showing buildings that look both coherent and ruined, covered with verdant vegetation, while a menacing black ship prowls air above the streets.
I’m fairly certain that nearly every botanical element produced by LEGO appears in the build somewhere, from vines to leaves to leafy vines to seaweed and more. Even the sprues from the three-leaved plants appear as vines. It is a lush city. The bad guys (you can tell they’re bad because they wear black) are aliens trying to kill the humans to harvest natural resources (like Avatar in reverse), and their ships are filled with greebles, especially ones from the Batman pack. Of course, with evil aliens on the prowl, one of the poor kids has lost his teddy bear crossing a street. Kids, I tell you what. Good thing they’re cute.