I'm not trying to be offensive, but that sounds like filing apple under "f" for fruit. I understand how it works, but I also think you are missing the point. There is evidence that suggests that search engines also look at file names of pages. You have stated that this is not a concern for you, but it would be for most.

I guess the question most would ask is why look for the "p" section for an image when you could simply name an image with a descriptive name. If I'm looking for a specific images out of hundreds, it is much easier if the file name is descriptive of the image. To put "p" in front of an image is a bit redundant as most image files are GIFs or JPEGs. Again, if it works for you, go for it. I'm not trying to change your mind, just showing you how most would find it problematic.

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