1.Create a 500x500 image. This size is for the example, of course this can be made with other sizes. But my advice is a big size.
2.Filter - Diference Clouds a few times
3.
Filter - Brush Strokes - Ink Outlines
---Stroke Length: 1
---Dark Intensity: 50
---Light Intensity: 0
4.Filter - Brush Strokes - Accented Edges
---Edge Width: 2
---Edge Brightness: 38
---Smoothness: 5
5.Filter - Stylize - Glowing Edges
---Edge Width 2
---Edge Brightness 6
---Smoothness 5
6.Filter - Artistic - Cutout
---Number of Levels 5
---Edge Simplicity 5
---Edge Fidelity 3
Final result:
Tutorial by: Akaiho