Here’s a response I did for Uni. You might like to try the exercise out yourself.
Write a haiku (formal style) on the theme of water and then write a free verse piece (of no more than 10 lines) on the theme of water. Which style worked best for you? What stumbling blocks did you have to overcome in each?
Your water cascades
Caressing valleys and hills
I will drink deeply
How deep my heart has sunk,
amongst broken hulls and dead men’s skulls,
coral memories and crustacean verdigris,
viscous cold and furtive shoals
shaping origami headstones,
draped in ocean’s finery.)
How drenched is my heart,
drenched in depths
I enjoy writing Haiku because it can be challenging to find a theme that works in the 5/7/5 syllable structure. Haikus can say so much in so little space and it’s one of the reasons I love them so much.
Free verse is always fun, because I can play around with meter and time, line length, enjambment, etc. without any need to worry about poetic constraints; it’s easier for me to come up with interesting imagery. Often the theme of the poem presents itself as the poem progresses, or a new one is formed when the poem is completed.
I love free verse, but I believe that learning forms with specific poetic structures (such as the villanelle, sestina, pastoral, etc.) force you to be a better poet, because you have to work outside your comfort zone and within a stricter format.