How to make Vertex and Edge appears like this?

Mar 25, 2010 at 3:56 PM
Edited Mar 25, 2010 at 3:57 PM

First of all, thanks for your great work!

At the home page, I found the second picture interesting. And I'd like to make my project have that "theme".

what kind of Layout Algorithm should I choose and what kind of theme should I apply to vertex and edges?

It will be appreciated if anyone can give me some suggestions.