In various (and varying) poetic forms.
This includes (but, is not limited to):
Odes, Sonnets, Haiku, Tanka, Villanelle, Ronda, Narrative Verse, Haibun, Limericks, Clerihews, and the like.
This poetry licence (license) does not condone puns; however, the misuse (or overuse) of punning will be frowned upon by the public at large – so ‘please don’t!’
Free verse is allowable; although there ‘must’ be a valid reason for writing in this format (what that valid reason may be is between the poet and the poet’s conscience).