First, I love Video Game stuff so I made a giant gold and obsidian triforce in the sky, something like this photo but MUCH much MUCH more huge (you could see it while chunks were loading waaaay off the map
Another good couple things have been my massive fortresses, both in the sky, on the ground, in the jungle, and deep underground.
Here's one of a Pagoda, again mine was much bigger because I prefer huge/massive scale productions:
I have MineCraft for the 360 if anyone wants to play sometime, my xbox live usertag is xX Shimus Xx