I'm not a builder. I prefer safe, heavy defenses and functionality to something grandiose but empty and impractical at the same time. When I see someone's work, first I admire it, then I start wondering how many creepers and zombies would spawn in it if it were on some other difficulties than peaceful.
The closest I have done is a Cobblestone castle in my main base. Ground floor is the throne room, first floor is my room, second floor is the trophy room, roof has access to a huge tower where I go at night to admire the view.