Autocad has another program called Impressions. I know that it was a freebie in 2009 if you had a subscription for Acad updates. It did rendering and other stylized things like pencil or different pen type looks to your Acad drawing. They had a free limited amount of time demo that you could download from Autodesk. I would guess that they still do.
I have not checked out Acad 2011, yet. … quit the subscription and still using 2009.