Living in an older, small town not too far from an older, small city, I find myself shooting this sort of thing from time to time. It is interesting, challenging, and fun. I particularly like trying to capture the colors and textures of brickwork as in numbers one and two, and exploring the history represented by things such as numbers four and five. I like getting bright, vivid colors in this situation just as you have done here. (I make liberal use of Clarity and Vibrance in Adobe Camera RAW with these types of pictures.)
You might play with cropping and doing some extreme transformations to see how you like the results. For example, in number five try cropping off some of the sky and that bit of architectural detail on the left to concentrate more on the faded signs. Often with shots like these I will try to really tweak them using the transform tool so that they look like they have been shot straight on rather than from street level. Sometimes the result is good and sometimes not, but it is interesting to experiment with, anyway.
I guess I'm just rambling here, but the bottom line is I like these and think are the the sort of shots that lend themselves to some experimental post-processing. 