Randaom square panel subdivision

this is what I am trying to achive.
I have been lookin around and I found this post
http://www.grasshopper3d.com/forum/topics/uneven-surface-subdivisio...
where luis fraguada gives some ideas in how to achive something similar but not quite what I am looking for
here there is an other link, here is the main idea
http://natewm.com/blog/tag/random/
thanks take care
any idas??