| Create a first layer |
 | filter->render->plasma & image->color->desaturate & image->color->color balance (use green and yellow) |
 | filter->render->mosaic |
| Create a second layer |
 | filter->render->plasma & image->color->desaturate & filter->map->bump map on first layer with second (increase depth) & hide second |
| Create a third layer |
 | use linear gradient tools (foreground to alpha) to make a nice drakening area |
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