Hi Tom!
Thanks for the kind words!
My "Photoflats":
I made them out of photos I had taken.
In a former life, I was involved in building CAD models and installing same into a "virtual" train simulator. I would use photos to "paint" the CAD structures. Here's a few examples:
And here's a tunnel portal being constructed. I used photos of some rock masonry work I had found and photographed for the "paint". Here is a screen pic of the actual program I use for such:
The above need taught me how to deal with imperfections in the photograph ("keystone", etc), as well as manipulate photos (removing high line wires, fixing windows, etc).
Once a suitable photo was "doctored" and ready for use, I then sized it, printed it out (in sheets if needed), then cut/pasted to mat board and attached to the wall. I have a sizable photo "library" with more being added as I find them. Some of the photographic subjects are older brick buildings such as appear on the "Photoflats" I used on my "mock-up" layout effort.
Andre