Here is a Cultural Literacy worksheet on purple prose in both written and oral communication. This is a half-page worksheet with a reading of one phrase (a fragment, really, possibly the first I’ve seen in this material in 15 years of working with it) and one short sentence, followed by two short comprehension questions. If your students understand the adjective “ornate” and “flowery,” this worksheet will do the job; otherwise, some vocabulary building might be prudent.
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.