http://photoshop.msk.ru/as/ngrave.html#le
I *really* like the effects
Xylograph LE can render, especially when applied to faces. Layers rendered using different settings can be combined with blend modes or layer masks.
Since the output is black and white, layers can be used as the basis for saved selections or, when either the black or white sections are "knocked out," one can apply Layer Styles.
The "pro" version (more options, controls) is available in the (not free)
Plugin Pack collection (
http://photoshop.msk.ru/as/). It was used by Lyle in the 3rd post in
this thread. The LE edition could be used to achieve comparable results.
~Danny~