What started me off was a poetry contest in a newspaper when I was in college. No entrance fee, just a .25 stamp and a poem any style/subject. I wrote one titled "Cupid" which appeared in an anthology in 1993.
"Cupid"
Cupid travels both far and wide,
and from his arrows you cannot hide.
Cupid's bow is small but strong,
you may escape but not for long.
His arrows never miss their aim,
yet they never rend, tear, or maim.
He is never seen but is always near,
and weaves mans courage from his deepest fear.
He is small in stature, but big in power,
for in his presence love will flower.
I favor the couplet format a bit.