@HeadClot: The demo unfortunately was artistically limited by my own 3D modelling skills. 
However, you can thoroughly customize the look of buildings. If you are a programmer, you can take the customization even further by writing your own geometry generation algorithms if you so desire. (Fractal buildings FTW 
) I have covered this in a fair amount of detail in Vlog #7: Extensibility FTW.
For anyone who might not have seen the demo, here it is: