In the film, there's the outside world the characters physically inhabit, and then there's the interior drug stupor/world they enter. The outside world is being reclaimed by nature. Everyone's on the drug, and people aren't really around anymore (or in any shape to do any landscaping), so nature is taking the city back. Green and grey as the color pallet for these sequences.
This contrasts visually as well with the drug world, which I'm thinking of as an internal, visceral place. Reds and blues for blood and insides. Also sex and smut (red lights) and evil science and chemistry (blue, cold) vs. the outside natural green and concrete world.
There's also an idea we're working with of jerry-rigged weapons. Started looking at prison weapons for inspiration, but want our weapons on a bigger scale. Really enjoy the ingenuity and nastiness that goes into thinking up these weapons, though.