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1. New White Image, size doesn't matter (or so they say). But for my
example, 256x256 would be best.
2. Filters>Render>Pattern>Maze (Or whereever it is located in your GIMP). -Make the Width and Height of pixels to be 1. You should see a VERY small maze, of course. |
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3. Make a new white layer, we'll call it Maze Dos. Hit Alt+shift+f (or just
rerun the maze filter). -This time make the width and height of pixels to be 2. |
 | 4. Make a copy of this layer. 5. On the copy, filters>blur>Gaussian blur (RLE) 3x3. |
 | 6. Select the original Maze Dos, and go to image>colors>brightness & contrast. Increase the brightness to 127 |
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7. Run Filters>Map>Bump Map on the original Maze Dos layer. Select the Maze Dos copy layer as the map. You may use default settings if you so choose. More whiteness usually equals a bit more variety, but don't go overboard. |
 | 8. Disable or Delete the Maze Dos copy. On layer Maze Dos, change the filtering mode to "Multiply (Burn). |
 | 9. From here, there are very many things you can do. Copying the multiply layer (and making the opacity 50%) makes the pattern a bit better looking. You could make a new transparent layer below and, using the paintbrush tool and a 3x3 pixelbrush, paint small gray streaks randomly between lines. This allows the bump-mapped maze layer to stand out more, and therefore, seems to create large pipes or as if it is melting. Adding black, of course, makes it seem as if there are no wires there. |
 | Take a look at my signature for an example... |