Nope. Just using the B&W to act as a mask defining the "inside" and then building a map (with an optional distortion step).

Layers generated are (top down):
-Wall Style (bevel or stroke)
-Wall Fill
-Wall Shadows
-Grid Bump Overlay
-Grid Stroke
-Floor Plasma Noise Overlay
-Floor Texture

So they can all be tweaked. The floor and wall-fill textures are either procedural (the previous example), or you can specify a Gimp pattern.

In place of the bevel, the wall style can be a solid wall with a pattern (or solid colour) and optional bevel. It does end up giving you a lot of options though....

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-Rob A>