If you are trying to teach others about writing poetry, how should they get a start? Will they set out to rhyme? Will they rely on imagery? Will they make a list of words they have to use? Will they use magnetic poetry as a tool? Will they be offended if their funny poem doesn't make anyone laugh?
If you can make the time, there are several poetry-building tools for your perusal. For example, Read Write Think is a top-notch resource for accessible activities. One of their most popular games is Word Mover-- a bit like using magnetic poetry, with the capability of resetting a word bank and including our own vocabulary. Other options include ReadWorks' lesson on rhythm for 1st grade and LearnZillion's learning-to-read poetry post for 3rd grade. For reluctant readers, try the PBS Haiku game or the Fun/Games page on the Shel Silverstein website. For specific lesson plans, try using Poetry Archive or the National Education Association.
And if students don't finish writing their poems, there is always the Paul Valery quote, "A poem is never finished, only abandoned."