Andy Warhol paid the bills in NYC as an illustrator before he became a pop art legend. He illustrated for record covers, magazines, advertisers and childrens books. He even won awards at it; I have an Art Directors club annual from the 50's that recognized his work. You can look more closely at the pictures from The Little Red Hen (pictured above) and the Magic Porridge Pot.
You can also flip through the Harper's Bazaar Archive Lookbook (from my earlier post here) and find a couple of Warhol shoes, but the collection posted on the blog Fabulous Doodles is more immediately satisfying. Check out Part 1 and Part 2.