Hi,
I did this with some nodes and the new QMC ambient occulsion implemented into Blender by broken.
Constant QMC 8 samples. Render time with nodes about 36 seconds (amd64 3500+ @ 2.4GHz single core)
Here is the blend (1.85mb, you need a new SVN for it to work properly)
The new ao has a lot less noise, which you can get though, if you decrease samples. It’s just better. The shadows seem to be somewhat deeper with the QMC sampling, which might be a result of the lesser noise.