Fables

1. Write a fable.
Fable: a brief, succinct story, in prose or verse, that features animals, plants, inanimate objects, or forces of nature which are anthropomorphized (given human qualities), and that illustrates a moral lesson (a "moral"), which may at the end be expressed explicitly in a pithy maxim. A fable's purpose is to impart a lesson or value, or to give sage advice. Fables also provide opportunities to laugh at human folly, when they supply examples of behaviors to be avoided rather than emulated.
A fable differs from a parable in that the latter excludes animals, plants, inanimate objects, and forces of nature as actors that assume speech and other powers of humankind.

Or use one of these fable quotes to spur on your writing...
2. "I am sure the grapes are sour." Aesop, The Fox and the Grapes
3. "It is not only fine feathers that make fine birds." Aesop, The Jay and the Peacock
4. "Do not count your chickens before they are hatched." Aesop, The Milkmaid and Her Pail