In this tutorial we will create the effect of three-dimensional blocks.
Create a new document, click CTRL+N. The author used 500×500 pixels (you can take any size). Further Filter> Render> Clouds (Filter> Rendering> Clouds).
Now Filter> Pixelate> Mezzotint (Filter> Design> Mezzotintto)
Further Filter> Blur> Radial Blur (Filter> Blur> Radial Blur) use the settings as in the figure.
Again Filter> Stylize> Extrude (Filter> Stylize> Extrusion) adjust as shown.
Finally go to Hue/Saturation (Hue / Saturation) and adjust as shown, you can experiment with colors.
This is what should happen.