For Whom the Bell Tolls
Bricks! (A ton of bricks...)
The bricks are made out of XPS foam (insulation foam).
I cut them to a size of about 5mm x 5mm x 10mm, but I didn’t use a ruler.
I eyeballed the size when batch cutting/crafting them.
I ended up with bricks of varying sizes which is perfect to give a ramshackle appearance to the brick building.
I think smaller bricks look better/more realistic than bigger bricks, but they do take more time to glue.
Bricks! 
Random pieces of XPS foam 
Bricks before and after going through "the Tumbler" I used the tried-and-true method of placing the XPS foam bricks in a container with a bunch of jagged rocks, then shaking the can for a few minutes.
It helps to roughen the bricks, give them a bit of texture and it gets rid of the perfect square corner.
I cover the bricks with a mix of black paint + mod podge.
Just a can with some sharp rocks
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