My 3D Stone Tool.

[Krisidious]

I've been using Jim's Protrude tool with some good results.

using the offset for half of the mortar width.
height for the variance of stone protrusion from the starting surface.
Taper I don't use and leave at 0

http://sketchuptips.blogspot.com/2007/10/plugin-protrude.html

The Greeble2 tool is also a good tool for brick and blocks

http://www.smustard.com/script/Greeble2

[dale]

That looks damn fine!