They are white and bigger than the stones used for the walls, although there is a lot of dirt between the pavement.
If you look closely at the picture where I write: “and another”, you will be to see that there are different tiles. Big tiles near the building, very small tiles to the center of the building.
Kope, I just think that the pavement you made, although extraordinarily excellent, seems to small, too cracked, and too dirty. Although, just to make Minas Tirith look more natural, some places should have different textures. In example: the corners in the streets. The only problem with this is the fact if computers will be capable to run the realtime viewer at reasonable fps.
Keep up the good job. For the moment I am busy but I promise that I will post a lot more refs.
For the moment have a nice day.
P.S.
By the way, I don’t know if you mind Pjanseen, but I will try to get some experienced modellers from other forums to join the project.