Backgrounds, model sheets and Layouts:
Here's a page compiling some images of background paintings and layout drawings, which would ultimately become the guide for filming the animation over the backgrounds. Also included here are some model sheets. Usually drawn by the director or a key animator, these were photocopied and given out to all the animators to show them the key poses and expressions of a particular character.
WB Cartoon Art page 1 (Drawings) WB Cartoon Art page 2 (Cels)
WB Cartoon Art Page 3 (Backgrounds, layouts and Models)
A 1940's Porky Pig model sheet from the Arthur Davis unit.
Robert McKimson model sheet of Hippety Hopper from the late 1940's.
Background from an unknown 1950's cartoon. Very UPA studio influenced, so probably from around 1954 or 1955.
Background from a Chuck Jones Wolf and Sheep Dog cartoon, late 1950's
Background by Phil DeGuard from Chuck Jones' "Who Scent You"(1960).
Background layout sketch by Maurice Noble for Chuck Jones' "The Abominable Snow Rabbit" (1961).
An early 1960's model sheet of Speedy Gonzales from the Friz Freleng unit.
Layout drawings (probably by Robert Gribbroek) from Robert McKimson's "Birds of a Father"(1961), featuring Sylvester and Sylvester Jr.