This is the cover of a recipe booklet distributed to housewives to demystify bananas, which suggests its age.  That cover sure looked promising when I bought it, but the illustrations within are blurry and blah.  Peach of a cover though, especially the implied snobbery.

Here's another example that impresses in part because it was essentially just advertising - yet such quality in the art!  Here's the cover of a Wesson salad oil booklet from 1920.  So gorgeous.