I happened upon this site while looking for something else. The guy does some really neat modeling in creating detailed surfaces like interior and exterior building walls and ground cover.
https://davidneat.wordpress.com/tag/sealing-and-coating-foam/ (https://davidneat.wordpress.com/tag/sealing-and-coating-foam/)
(https://davidneat.files.wordpress.com/2013/09/dsc02045sm.jpg?w=768&h=576)
(https://davidneat.files.wordpress.com/2013/09/156.jpg?w=768&h=576)