LOOK HERE:
https://www.plastruct.com/search?q=BRICK+SHEETS
It depends upon where your structure is. If it's a background building, you can simply paint the plain side walls the same color as the bricks. I did this on some of the the background buildings on my Sandy Harbor RY.
Painting the sides of the facades was my first idea...but in fact the building facades in question are very close to the viewer's perspective and form a background along two long runs in my basement, and these areas are cantilevered wall extensions, one of which is about 20" deep and the other is only 15" deep, thus having decent detail on the sides of those facades that sit on the ends is what prompted this inquiry. The picture above shows the façade background on the 20" extension. The left-most façade has a black side that gives it away as a façade. A little brick detail here would go a long way, I think.
Example of a façade with black side that IMO would benefit from brick effect:
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I was faced with a similar situation with an Ameritowne building. I have one that was finished on 3 sides, but had a plain/unfinished back... which worked fine, until I needed to relocate the building to the middle of the layout where the back would be visible. I tried using a different brick pattern on the back, but it just didn't look right.
In order to match the existing brickwork color/texture I took a picture of one of the finished sides, cropped and scaled it to match (which took a couple trial runs - including getting the lighting right on the photo), then printed it on a high quality printer. From there I just glued the paper in place, then added a fire escape over top of that to sell the effect. From more than a foot away you can't tell that the brick is just paper. If I can snap a pic later I will post it.
-Dustin
Edit: Added pics of the "take a picture of another wall and glue it" solution for adding brickwork to a blank wall. Not perfect... but not too shabby either:
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I ended up ordering some embossed brick sheets off a seller on e-bay...unfortunately the seller is in Greece or China and shipping may take a while. But, from all the sources, his sheets appeared the best. I went with an aged looking brick look...hopefully it'll be an easy project because I always was lousy at arts & crafts, which may explain my affection for the 3-rail side of the hobby.
