Unfortunately, I did not take WIP shots of each stage of the skin creation. Through creative GIMP brushwork (and royalty-free brushes), I was able to create artwork inspired by H.R. Giger's from Alien. I believe the artwork is unique enough to be its own skin, rather than "hey, look Alien in CS:GO!"
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http://steamcommunity.com/sharedfiles/filedetails/?id=678467921