Okay,
The first thing we thought of was making a large wall of stone bricks. To do this, we had to craft each and every brick by hand using clay. (we're using air-dry clay here again)...
As you can see in the photos below, we used a wooden block to knead the clay around to give it the general block shape. I purposely gave each brick face a different texture so they all won't look uniform.
Onto the pics!
Motoring right along...
We're almost done ~ about an hour later...
And here we're completely done, letting them air-dry in the beautiful British Columbia sunshine. You'll notice that I made a few half-pieces... this is for the rows that will be offset by half a brick so they're staggered on the wall.
Phew! That's done.
Cheers! ~ Paul.