Manolis Papadakis's Comments

I will upload this model and Voronoi pattern generation soon. You can see littel of this from my Blog, http://www.grasshopper3d.com/profiles/blogs/10-gh-080009-example

Process is as follows.

1)Create Points array to X-Y

2)Delete some points from array randamnly.

3)Move position of points array randamnly

4)Connect those poits array to Voronoi component

  Simulate frpm 1) to 3) until favorite Voronoi created.

5)Get some poitns from Voronoi lines

6)Create periodic curves from those points

7)Bake into Rhino and modify shape as you want

8)MapSurf to base surface then split