Awesome! I had been working on a similar project couldn't figure out the snow on the trees for the life of me! It's great to see how you approached it. The work look great! Thanks for sharing your process.
I believe author would be surprised that it's not american, but soviet bunker :)
Super Bricks Tool allows you to procedurally create complex and organic looking brick walls within a matter of minutes. The tools gives you control over tons of parameters for you to define the look and design of your walls.
The developer is constantly upgrading his tool, so stay tuned for the updates with new features.
Installation instructions can be found in the ‘ReadMe’ file within the download package. Super Bricks Tool works for Maya 2015 and onwards (all platforms: Windows, Mac & Linux)