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the creation process of this mesh started very similar to the displacemed greeble cube I posted yesterday. I used a cube, selected a random set of faces and subdivided them. After doing this a view times I used select random one more time and extruded the selected faces.

Then I applied a subdivision modifier to smooth the mesh. Because it started to look really awesome in wireframe mode, I used a wireframe-modifier to create the final net-like structure you can see in this render.

you can download the blend file here