Hidden away in an archived forum post for some time, but now more easily available here at CarraraCafe.
The free plugins for Black/White and Sand rendering by Muphasa support Carrara 7 and 8, 32/64bit.
Included in the zip file is also the original forum post with some additional information and installation instructions.

CarraraCafe download link: http://carraracafe.com/?page_id=22&did=24

Original forum post is currently online at:

Some sample images:




















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