Circuit Board in Photoshop 7
by TutorialPark
Step 1.
Create a new Document. Press 'D' to reset your colors.
Apply Filter > Render > Clouds.
Apply Filter > Pixelate > Mosaic : 15 Pixels and apply Filter
> Blur > Radial Blur (Settings: 20, Zoom, Best); and Filter >
Stylize > Emboss (Settings: 135,10,170).

Step 2.
Apply Filter > Brush Strokes > Accented Edges (Settings: width:2
brightness:38 smoothness:5) and Filter > Stylize > Find Edges
then press CTRL+I; apply Image > Adjust > Brightness / Contrast (
Settings: Contrast +30).
And that's it.