The main square will be needing some variations of cobblestone. I have been thinking about it quite a bit today and I can't come to a decision on this one yet. A bit overworked with materials I think.... So!... I did a quick paintover and a frew variations of the middle square. I'll come back to it propably tommorow when I will have some fresh ideas.
In this one I used a quick multi sub object materials to devide the cobblestone variations. Each color represents a different cobblestone pattern.