My first build was back in vanilla, I don't think rtb was out just yet.
Anywho, it was a simple house that was above the water in green hills.
I didn't get to finish it because a douche, by the name of Jomama, hammered just the right brick.
Then in rtb I didn't spend much time building, just exploring peoples builds and painting things.
and in retail my first build was "Low Rent Apartments" in the Wankit City build.
(screen shot may follow)