Found some RTK concept art

[kalelinri]

here you go from the website
http://www.ianjamescolmer.com/gallery2.htm

http://www.ianjamescolmer.com/strip1.jpg
http://www.ianjamescolmer.com/strip2.jpg

[kalelinri]

the front page has a better look at the top left image

http://www.ianjamescolmer.com/

[FilmNerdJamie]

That belongs in the Superman Returns section.

[\S/JcDc\S/]

Seen these, wish there were tints of red instead of pure grime.