Olicanalad’s Games has an illustrated article on making Arab / Middle Eastern style buildings.
Terragenesis has an article on building an underground Jedi headquarters. It would work as a Hobbit house also.
Terragenesis has a tutorial on making a nice looking fuel depot from the green floral foam.
I always knew there were wargames applications for that stuff.
Terragenesis has a nice article with ideas for modeling alien plants.
Boromir and Kermit have a tutorial on building a magnetic scoreboard for your Games Workshop BloodBowl games. Actually, there are a lot of sports games out there right now, and this would be adaptable to any of them.