A few people following my project to produce built-up areas suitable for Maurice (and other games) commented that the buildings would look better on a cobblestone base. So I produced a prototype this evening. I say 'prototype' actually I printed off a square of paper featuring a slightly edited version of this texture from Flickr user Gerald Menzel.
Here it is with some buildings on it, and some unpainted cavalry (the painted units weren't to hand when I took the photos).
And here it is in its 'garrisoned' configuration - minus the garrison.
I shall probably keep the buildings on their own small grey bases, just to provide some contrast, although I may experiment with them on cobblestones as well.