Well, not a impressive image, I know but it have some particulars that makes it little bit special:

Not a single bitmap texture has been used to achieve it.

Only 3D procedurals have been used instead. Since 3D procedurals are projected on the 3D space and effects as Ambient Occlusion depends on the geometry only, it avoids the UV mapping work required for a bitmap version.

So, we gonna learn how much powerful procedurals are, and also some basics regarding shading/lighting.