I have very little experience building and painting terrain and don't consider myself very good. That being said, here are some of what I have done.
First couple of photos are some terrain pieces I made for a post-apocalypse game and first time I tried to paint rusty metal.
The next couple of photos are some modern buildings for my Force on Force games set in the Middle East. They mostly just need paint and think I'll go with an adobe paint scheme.
Small Building which still needs door frame: