I'd get an Illustration Annual from a half price book store or maybe the
library.
An advertising agency or illustration studio may lend you one too.
You have to look through it to make sure it is appropriate- especially these
days.
As an ex-illustrator, I would spend hours wading through it and getting so
excited. There are so many clever ways to sell a product, convey an emotion,
or tell a story.
Brenda