I know this is more /r/ territory, but I know to tried there already.
I saw a wallpaper a long time ago with a woman that was in either silver or white-ish armor, wearing green goggles and she was holding a gun aimed downwards with a mech in the background.

It was a futuristic picture, and I lost it somehow. If anyone could help me with it, I would be grateful. In return, have some wallpapers.