Visualizing clumps

I just posted this blog article:

http://flyingfrogblog.blogspot.com/2011/11/what-is-your-garbage-collector.ht
ml

I used Mathematica to visualize the structure of the clumps (weakly
connected components) being collected by my mark region collector whilst
running a list-based n-queens solver. In this case, 84% of unreachable
connected components are isolated 2-element lists and only a handful have
interesting topologies.

I'm curious if anyone can think of a common benchmark that is likely to
produce more interesting garbage. :-)

-- 
Dr Jon Harrop, Flying Frog Consultancy Ltd.
http://www.ffconsultancy.com