I don't have a lot of space to store my scenics between games, so I don't base my buildings. The main drawback is that once on the table, the buildings are too perfect.
I painted up several additional building bases from Pardulon,
http://pardulon.com/ . They greatly enhance simple buildings by breaking the ground lines.
It should be easy to do the same from scratch, but they are rather cheap and some of them have interesting details such as barrel, wheel, etc.
Olivier