"Sculpt Self" is in Dragon #304. It's part of the Prestige Races article that was the first OGL article to appear in Dragon. Taking that feat is what allows you, with time and experience points, to alter your race. It's worth noting that the feat originally comes from some product by Bastion Press, but I can't remember what.
Does anyone know how much of that article was OGC, by the way? The d20 License was in the back, but nowhere did I see a Designation of Open Game Content, which I thought was mandatory since the License says that all OGC must be clearly indicated.