Stones

1. Scan or Download a rock Texture.

2 . Define the shape of the stone .

3. Copy/Paste in a new document.

4. Apply Bevel and Shadow .

Photoshop 7 Steps
4. Duplicate the Layer.

5. Turn the Fill value to 0% and apply a Bevel and a Shadow.

6. use a 25% Eraser to create bumps on the surface of your stone.

Voilà!

Read more about Quick Masks, Layer Masks and Saving Selections