This is a concept for when I worked on Firefall at Red 5 Studios. This was an ideation done on a blockout. (a buncha basic blocks put together to imitate the playspace). I went in and concepted out what it may look like once we artified it,so we could figure out what assets we would need to make for the area.
In this case it was The Rig, an aptly named oil rig turned to storage area for one of the game's companies. Meant to be a PVP location/stage I worked with some talented friends of mine Mike Altuna, David Kang and Steven Rich (all at Blizzard now, I believe). So I quickly painted out the look and feel for the area and this is one of the initial images we used. Main idea was to use some cool and warm neutrals and then have colour pops help define edges and items of importance. (Thus railings being yellow, upper platforms orange, etc). This was to not just make it look cool but also allow for different areas to have colour definition and unique items so you could tell where you were at a glance. It's messy because we were trying to save refined concepts for more exact items and save time since we had a very short amount of time allotted to each area. All very basic, but I am typing it out for any uninitiated.
In the end it actually hit pretty close to concept, though timeline and limited resources forced us to cut a lot, such as the towers at the top which weren't important so we could have more for the interior.

Thanks for taking a look!