Thanks for all of the comments.
As to what it is, here's the long version. On layover in Chicago and not really wanting to cruise around town in an empty coach bus (company doesn't like paying the extra fuel bill), I took off on a walk. I ended up covering just under 11 miles and really didn't find much to shoot. Within a quarter mile of being back to the hotel, I walked past the front of a couple of large stores. This was actually a shot of the concrete wall panels on the outside of the store. I guess there's something to be said for the old advice of not working so hard and just looking around where you are....
Ken - I considered cloning in the corner, but didn't want it to end up as too much of a black hole down there, interrupting the pattern. What do you think about lightening it up a little to bring out some detail?