The wonderful, wonderful thing about free verse, is that it has very few distinct rules or boundries. It is similar to blank verse in that it does not rhyme, but unlike blank verse, it is not written in iambic pentameter.
The rhythm or cadence of free verse varies throughout the poem. Though the words don't rhyme, they flow along their own uneven pattern.
Definitely a poetry form for one who likes to march to the beat of a different drummer!