1. First of all open a new document, here I have used document size=420x420 pixel, 96 resolution
2. Now press "D" on your keyboard and go to Filter >Render>Cloud
3. Now go to Filter>Sketch>Halftone Pattern and use the setting below
4. Your image should look like this
5. Here go to Filter>Stylize>Find Edges
6. Go to Image>Adjustment>Invert or press the Ctrl+I
7. Now go to Filter>Stylize>Extrude and use the setting below
8. Your image should look like this

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