Swamps.
I mean, come on. [url=http://www.oocities.org/echoes_ca/geschichte/Swamps.jpg]This is[/url] practically screaming to be used in a game.
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Something I've never seen before. Imagine a Precursor environment for Halo 5/6. I'm imagining a vaguely fractal based design for the environment. Woah there. Futuristic tech that takes inspiration from fractals in terms of aesthetic design? I'm in.