Hello!!!
Just something interesting I found in the BE forums. It allows you to create Voronoi diagrams in GC, with the use of a program called QHull that you need to install. Instructions can be found on http://www.cerver.org, as well as an explanatory video of how it actually works.
I tried to make it work but I was not able to, I think I have not installed QHull properly as it seems to be a bit tricky. However, the programmer told me that it should work better in the V8i. You can track the conversation in the BE forum for GC.
http://communities.bentley.com/forums/39544/ShowThread.aspx#39544
Cheers!