Here is the concept art for the level of Interphase that I created. The second image is where I used the inverse option to give a 'photo negative' look to the image. I do prefer the first image due to the colours that it holds. However, the tissue region(stuff that looks like a brick wall/ giraffe skin) in the second one is bold and looks very striking. It also has an 'X-ray' look about it that seems to fit the theme of the game.