Found these great sketches and storyboards for Ren & Stimpy from the http://www.animationarchive.org - while I was at it I ran into some of Scott Wills intense acrylic paintings from the show too...
Spumco - Vincent Waller
http://www.animationarchive.org/2005/11/media-spumco-vincent-waller.html
Jim Smith Ren and Stimpy Layout Drawings
http://www.animationarchive.org/2007/05/auction-jim-smith-ren-and-stimpy-layo...
John K's Storyboard For Stimpy's Invention
http://www.animationarchive.org/2006/03/media-john-ks-storyboard-for-stimpys....
Ren & Stimpy Big House Blues Seq 03
http://www.animationarchive.org/2007/01/story-ren-stimpy-big-house-blues-seq-...
Candy Cane Land - Scott Wills Paintings
http://animationbgs.blogspot.com/
More here: John K Ren & Stimpy
http://johnkstuff.blogspot.com/search/label/Ren%20and%20Stimpy