Irregular stanzas can be found in all types of poetry, from the earliest forms of oral poetry to modern free verse. Some of the most famous examples of irregular stanzas include the terza rima of Dante Alighieri's Divine Comedy, the ottava rima of Ludovico Ariosto's Orlando Furioso, and the blank verse of William Shakespeare's plays.
Here is an example of an irregular stanza from William Wordsworth's "The Prelude":
> There was a time when meadow, grove, and stream,
The earth, and every common sight,
To me did seem
Apparelled in celestial light,
The glory and the freshness of a dream.
This stanza does not follow a consistent pattern of meter or rhyme scheme. The first line has ten syllables, the second line has nine syllables, the third line has seven syllables, and the fourth line has eight syllables. The rhyme scheme is ABCB. This irregular stanza helps to create a sense of wonder and awe at the beauty of nature.
Irregular stanzas can be a powerful tool for poets. They can be used to create a variety of effects, from chaos and disorder to wonder and awe. When used effectively, irregular stanzas can help to add depth and complexity to a poem.