This is a writing activity rather than a creative prompt. There is the potential for being creative and through copying the model poem Elk River Falls by Billy Collins.
I haven’t altered this much at all from its original format [and its beginnings can be read here]. It is quite a complex task for students/writers, but that was the point in some respects.
Above all there is a genuine focus on the listening to and hearing the rhythms of one’s writing, the idea is that this empathetic approach to writing is better than the formulaic/grammatical, not that functional elements do not matter as is evidenced in the activities to do with punctuation and connectives. But the idea is to foreground the empathy – that ‘feel’ for writing writers do develop.
Resources:
The two following Dickens’ resources are an extract from Dombey and Son as an example of mimetic [and therefore empathetic] writing about the movement of a train, relentlessly forwards. These can be used as a further example of the long sentence is wonderful operation [the second version removing the dark references to ‘death’].
Creative Writing for Copycatters 