Attached Link: http://blog.zgock-lab.net/poser/yatoon/en/

You might be interested in the Yet Another Toon shader.

It's a nice freebie that gives a cell-style (toon) shading effect at the shader rather than render or scene effects level. (You can mix cartoonish with realistic that way.) It drops in under the lighting model at the master shader level once installed, and has 9 adjustments for fine tuning. Looking at the ReadMe file before using it is a good idea, since it uses some of the normal shader channels in different ways.

Alternately if you want to try the "Toon!" thing that seems to come with Carrara 6 Pro, it's enabled by applying a filter to the scene instance. It works on the whole scene rather than specific objects when enabled, but you can apply an overide under object effects to dial down or exclude things from it. There should be some info in the Carrara help .pdf file on it. I haven't seen any tutorials spefic to this myself (at least as far as I care to search), but maybe we'll get lucky and somebody will pop up with an answer.

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Barbequed Pixels?

Your friendly neighborhood Wings3D nut.
Also feel free to browse my freebies at ShareCG.
There might be something worth downloading.