Here's so more Tex Avery model sheets. John K. suggested that I post these as they're favorites of his so how could I resist. These were drawn by Irv Spence who was an animator on many of Tex's shorts. Plus some of the best Tom and Jerry shorts and even on Ralph Bakshi's films. Please check out Cartoon Diary: The 1944 Cartoon Diary of Irv Spence, it has some really great drawings on it. If your curious, these model sheets can be found in John Canemaker's book Tex Avery: MGM Years. I believe it's now out of print but if you see a copy grab it. It's loaded with great images. I'm sure anyone who owns it will agree.
There's also some more I posted over here at DrawingBoard.org.