Too many young poets, mistakenly seizing on the idea that free verse is an art without rules, have been encouraged to reject any form as an encumbrance to the pristine expression of their feelings. Some of their best work is strictly traditional, and when they turned to the demanding discipline of free verse, they did so with the advantages of a thorough apprenticeship in their craft. If you are a developing poet you, too, might be well advised to look at traditional forms. The oldest, in some ways the easiest, and surely the most enduring of all poetic forms is the ballad. The second and fourth lines rhyme.
Ballads appear all through English literature.
Coleridge, of course, like most poets, uses the basic form only as a framework. And yet I could not die. And this was odd, because it was The middle of the night. With practice, you can make this four or six-line form a powerful vehicle for your poetry. If you have a story to tell, especially if it's a gruesome or funny one, you might try the ballad as your form.