I have used this one http://forumarchive.daz3d.com/viewtopic.php?t=79008  It works well

 

I also just saw this video http://blip.tv/johnnybevo/basic-clay-render-in-carrara-7-pro-4881840  I haven't had a chance to watch but now book marking his stuff.  Its also here too http://www.channels.com/episodes/show/15567645/Basic-Clay-Render-In-Carrara-7-Pro