I agree with Luca, there appears to be nothing special about that statusmap that you posted. What is it that you are speaking of? The icons seems normal, the layout is drawn by nagios in the circular mode. Other than the detail to which the tech made the parent relationship in the hosts.cfg file, I see nothing else eye popping.
It you like the way he/she has 4 hosts connected to one host, which connects to.. and so on, that is all done in the hosts.cfg file using the "parent" definition. Of which, I am a firm supporter of using.