Thread in question: http://www.giantbomb.com/mass-effect/62-560/mass-effect-wallpapers/35-417886/
I can't just let that sit like that...
They're sci-fi themed wallpapers(And Chrome themes) made by an artist called Cyborg, who, around two years ago, supposedly ceased to exist.
After some research, I've discovered that he died, and his friends/family took down his works.
Just letting everyone know, it's totally not OK to give credit to the dude.
The third wallpaper is actually an EVE Online wallpaper, not Mass Effect.
I found a couple wallpapers that look alright if anyone is interested. Here they are: