Nice job with the "dirty" looking backdrop; I can never seem to make that type of thing look right. Did you use Photoshop or something else? Regardless, this is well done. Like ApertureIndigo said, I am adding this to the list of pictures that cycle around for my wallpaper. I haven't checked your other stuff, so sorry if this is a silly question, but do you only do Portal logos like these? I am looking for one like this of the VALVE logo.