I just got accepted off the waitlist at noon today! I'd say contrary to what people on here have been saying, shoot your shot!! It'd be kind of strange of me to share what I sent to get off the waitlist, but if you scour sdn and reddit there are stories of people sending in poems or picture collages that combine interesting things about that person, their desire to go to medical school, and why that particular med school is the place for them.
If you're going to do it though, just make something that is personal to you and helps you stand out. I think cheesy is underrated.
What's the worst they are gonna do, say no? Best of luck everyone!