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This tutorial is kinda easy. But it is very useful for beginners.
You need the Trail plugin made by @pyrochild.
1. Make a small rounded rectangle as a icon-backdrop.
2. In a new layer, add the icon.
3. Duplicate the icon layer. The first layer will be the shadow.
4. In the shadow layer, go to Adjustments>Brightness / Contrast.
5. Twice times, adjust the image with -100 brightness and -100 contrast.
6. Select the cube using th