Michael Sporn, of Splog, has a number of posts about illustrator Errol Le Cain, and among them two devoted to his illustrations to poems from T.S. Eliot’s Old Possum’s Book of Practical Cats:

Growltiger’s Last Stand and Other Poems

Mr. Mistoffelees with Mungojerrie and Rumpelteazer

The posts also mention a projected, but never realized, animated version of Andrew Lloyd Webber’s musical Cats, based on Eliot’s poems, scripted by Tom Stoppard. You can get some information and see preliminary pictures for this Steven Spielberg production at Hans Bacher’s blog its-a-wrap: post 1 and post 2.