ah, ok ...I misunderstood :(
Well, it's been actually posted once somewhere else, but might still be relevant to the topic.
This is few steps of a concept are drawing - not perfect, but I insisted on myself to not spend more than one week-night per concept, so that's roughly 5 hours ...
I thought it could be interesting to share the process, specially for people that have not too much experience drawing : doing most of the job in photoshop is actually a great way to cut on time, if you aren't overly concerne about "style" or "the hand of the artist"
Perspective is off, but I still liked the final result somewhat, so I kept it
Step 1 - quick sketch (one of many, I couldn't actually find the one that started the "final" drawing, so I took the closest I had )
http://board.flashkit.com/board/
Step 2 - paperpen sketch
http://board.flashkit.com/board/
Step3 - Scan, and port of sketch on a photoshoped "paper" texture
I mirrored it, and erased the parts I was unhappy with
http://board.flashkit.com/board/
Step4 - working on the green glow
http://board.flashkit.com/board/
Step5 - the full color work is made directly in photoshop - here it is without the outlines
http://board.flashkit.com/board/
Step6 - with Outlines - I stopped here, because I wanted the "concept art" feel for the drawing, so I watched not overdoing the outlines, nor the colors ... it is a quick work, but moreso, it means to "look" quickly done :)
http://board.flashkit.com/board/
and this is how it will look like in game (minus the fake Libram text )
http://board.flashkit.com/board/