how to make rubble from scratch ?
how do you make rubble for your dioramas ?

I create my own rubble. Mixed up some Durhams Water Putty ( or plater or what ever else you might use) and pour it out on a plastic bag ( I use 1 gallon zip lock pbags thicker and will not crumble up). I spread it out to the right scale thickness and the nlet it dry a little. before it hardens I score the surface the width of the brick or block I am trying to recreate. Once dry I simple snack it into the right length piece and toss it all in the bag and give it a few wacks witha rubber mallet to break it up and give mea variety of simplesand shapes.

Note: I always tint my putty mixture a dark grey to make it easier to paint later
AND
Before I pour the putyy out on the plastic bag, I spinkle or powder the bag with Dry Durhams. This way the back side of my bricks are not slick and flat, but have a textured finish.

hope that makes senseand helps. Maybe I can do a Article just on my rubble technique with PIXs.