Here's a picture of a double 8" curved brick. These are only "beta" bricks, so I only made one of each to mold. I just couldn't wait until the real thing was available!!! I had a bit of a problem getting the curved ends to match up with the straight pieces when the radius straightened out; generally, I let the glue dry, then cut the end of each adjoining curved brick so that it was parallel with the first straight brick.

I used a nutmeat picker and an X-acto knife to scribe the stones, starting out very light and then deepening the lines and rounding off the "stones."