Kakizome is a traditional Japanese way of greeting the new year with poetry, written for the occasion. In recent years this has become a Sunnyhill tradition as well.
Haiku is a form wiht three lines, the first with five syllables, the second with seven and the third with five. The lines need not rhyme. (See notes for example and submissions.)
Cinquain is a five line poem, with a structure which gives it the form of a diamond.
Line 1: one word to name the subject.
Line 2: two words to describe it.
Line 3: three action words about it.
Line 4: a four or five word phrase describing the subject (a thought, not a complete sentence)
Line 5: one word that means the same thing as the first word, or a word that sums it all up.