I don’t see a whole lot of unused concepts here, mostly costume designs that ended up in the film, but seeing the progression from art to reality is always awesome. Over on ComicBookMovie.com nailbiter111 has dug up some of those costume concepts courtesy of Aaron Sims.
Check out the mirrored images below, or hit up ComicBookMovie.com for the full details.
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The more I look at it, the more I really like the new Retaliation Snake Eyes design. MUCH better than the rubber gimp suit from Rise of Cobra!