Take a form OTHER than poetry and add a rhyme scheme to it somewhere. It doesn't have to rhyme ever other line but there should be a consistency throughout.
Afterward, think about what it does or doesn't do for your piece. Is it now totally inappropriate or did using rhyme somehow help you keep the tone of the work? Does rhyme automatically turn a piece into a poem?
Show me those rhyming essays, flash fictions, memoirs, etc!