That's a possiblity and a good suggestion. The texture would need to be changed, but I have some problems with the connection of some parts since this is my first time of really scening interiors. But that is going pretty well, so I will look what I can do.
Maybe you are or someone would be interested in making such as a texture. I can give you the name only of the texture, since I cannot come on the internet with my laptop and will be off in several hours until sunday.
EDIT: That is the stone_wall_interior in the Texture folder of the M&B root fodler. Best is to copy them to somewhere else and edit them. Or else ause a BRF file to see result or else ingame.