According to an article on About.com titled What Are Clichés and Why Are We Supposed to Avoid Them? - a cliché is any overly familiar word or phrase. As writers we are often warned to avoid them like the plague. However, like most rules, it's sometimes fun to break them. Especially if you can do it without causing any harm.
Our writing prompt this time is to write a short story or poem using as many cliches as you like.
My dog is happy as a clam,
My cat as fit as any fiddle.
You see what a bad poet I am?
Perhaps next time I'll try a riddle.