sorry about the mega late reply. heres a screen of the material for the plane behind:
and the material for the plane in front (the two obscured nodes are 'clamp' and 'multiply':
most of the opacity part of the material is taken straight from a light cone in dm_sanctuary.
also to note, the falloff texture should really be replace with one that fades to black on all 4 edges, but im lazy so meh.
yeh the concepts i found were randomly through google images, the only link i have is this one:
Inspiring Gallery of Video Game Concept Art | simoncpage.com
only one bit of dead space art, but lots of other yummy art from games.