“In these 6 video tutorials you will learn how to create architectural elements using ZBrush projection master techniques with Sebastian Legrain. These tutorials created by the Pixologic (makers of ZBrush) for the 3D community, so everyone can easily go at advanced level in ZBrush. Click on the below images to play that video. As always you can also download the files in flv format for later viewing.”
http://www.cgarena.com/freestuff/tutorials/zbrush/pixozbrush/seb_projection.html