There's a large book in the school library, Animation Art: The Early Years, by Jeff Lotman and Jonathan Smith, consisting of classic animation art. Much of it is devoted to cels of the Disney variety (and it's certainly not worth the price on Amazon), but here's a few Warner pieces I found interesting.
Hawley Pratt layout from "Racketeer Rabbit"
Hawley Pratt layout from "Stooge for a Mouse"
Bob McKimson scene from "What's Cookin' Doc?"
Bob McKimson scene from "Falling Hare"
Manny Gould scene from "Hare Ribbin'"
Original title art