If you like the look of the game, you can download this mod and swap the textures to your preference. 

This mod will not only swap the textures of the game, but makes the bricks and roof to have similar-looking texture to those of that are in the Witcher 2 game. 

It is recommended that you use the latest version of the game, otherwise the textures may be different.

If you don't know how to install it, it is pretty easy.

This mod is completely free and easy to use.