Whoo, I feel good. Thought I'd do a little experimentation doing fun stuff with my GPU, so I grabbed a model (and a texture) off the internet with some code samples and started pouring through.
When I finished setting up, I started with the really basic rendering scheme which doesn't look interesting at all...

... and right now, I got my effects doing something like this. Kind of looks like a sketch on a really rough canvas (at least, I think/hope it does), which was what I was going for. I even got the edge of the screen to only draw the model's edges, without drawing the model itself.

I don't actually have toon shading going on (I don't think that'd be overly difficult), but it's mostly what I wanted. The edge detection is pretty basic though, I should use something else for that.