What kind of poems do children like to write?
I think children will write poems partly depending on the repertoire of poems they come across. I often think that the job of teachers and parents is to make that repertoire as wide as possible so children can adopt voices and patterns of words and phases that suit them for the moment. If you only give children rhyming, jingly, jingly types of poetry, then the chances are that they will be the only kind of poems that they will make up. If you show them that there are all sorts of other patterns you can make with words, just repetition for example, then they'll discover that has its own power and use as well.