From a chapter by Peter Elbow called "Poetry as No Big Deal"

• Write a long string of lines without stopping, and begin each one with the same thing, such as: I wish, Once, Now, Yes, No, And, I remember ... or beginning with two/three-line sequences, such as: Once/then, I seem/but really, If/then, Question/statement, Morning/Noon/Night, 8 o'clock/9 o'clock/10 o'clock.
• Make each line a lie.
• Each line must include: a color, or a word in Spanish, or a part of the body.
• Write a short poem about an object you can see that begins "The (object)(verb)...." Within a line or two say "It makes me...." Somewhere include a question.
• Expand on that last one: describe a room or a place writing three stanzas which follow the preceding rules. However, the last stanza should not have a question.
• Write a short poem that begins with a swear word.
• Write a poem that begins with pronouncing a curse or spell on someone.
• Make a poem by writing it as a real letter to a real person.
• Use the demon who tries to stop you from writing; for example, make the demon talk to you.
• Begin a poem with a phrase and a negation of it (as in "To be or not to be").
• Write a poem that looks or talks about the same thing over and over again (as in Wallace Stevens's "13 Ways of Looking at a Blackbird").
• Translate a poem in a foreign language (this one is pretty involved...).