Well, I'm starting out in World of Minecraft. I've been a long time player, and just today I bought the game and joined. My past builds...

1. A pretty big city, with a 4 story office building, a lighthouse, and a neighborhood featuring my house.
2. I started out having a random map and (by hand, not by omen or anything else) and taking out all the trees, sand, dirt, and gravel, and only leaving water and rock. I quickly got bored with this.
3. A life sized Titanic, and I'm almost done. It's not a server.
4. A tiny town partially buried in the ground, which I flooded every so often.

So not much, but you know, now I know so much more.