I did a lot of experimenting making bricks for the walls on the inside of my roundhouse. The commercial products were not worth the price IMO and after a search on youtube found a guy that used full sheet (8-1/2 x 11)) label paper. It is already sticky one side of course so application was a breeze. I used "Avery" Labels I got at Staples.
The relief on the commercial products was minimal at best on the ones I have examined. The advantage of printing your own is you can get exactly what you want off Google images. Just use regular paper until you get the brick size adjusted right. You should have seen me holding my little ruler up to the computer screen
On cobble stone streets the size of the stones or bricks would be smaller on hills or at loading docks where the horse would need better traction to get started or to go up a hill. This is why you see different sized bricks in different locations.
In Vancouver there are still spots where the cobbles have not been paved over and as a kid with my nose up against the window of the old Pontiac I always thought it was sloppy work that the stones were not a consistent size, but then I became a model railroader and became wiser.
