Please see update at the bottom of page
Note: You can find edge nodes v1.1 from the download link on top right corner of this page. Have fun!
To ease the frustration of making the setup, I’ve prepared a template .blend.
It isn’t a straight forward solution (you can’t just swap the model out directly and render).
Please read the guide in the .blend. http://db.tt/PxzUN7u0
PS: It took me 2 hours to prepare the blend file from scratch even at my level of understanding.
Can feel your pain starting it from scratch with your level of exposure to this technique.
Update: The original Edge Nodes (ver 1.0 and 1.1) can’t produce the effect as well as my original files did. Some parts are different in the file (which I did to enhance edge detection) on normal and Z which aren’t good for silhouette detection for the effect. This (see below) updated file will get you to produce effects similar to the Humvee, Savoia S-21, Terran Barrack SC2, SU-27/J, and Suzanne. There are slight tweak between them but overall it will work with this .blend
Download Blend file to the render below: http://dl.dropbox.com/u/30119330/InknWatercolorEffects2.blend
And this is one that I did using some experimental effects but overall using the same method.