Since I'm applying JD/MBA, I'm also writing a personal statement for law school and they encourage you to be a bit more creative on that end. For law school, I'm writing a first person narrative about a specific event. I could see that working for certain b-school essays (there was one at Wharton that lent itself well to a narrative and I wrote one, though in a somewhat more standard format than my law school essay). In general, though, the b-school essays
go to this link to be asking for very specific things that lend themselves well to cogent essays. For example, Darden gave you only 250 words for a couple of their essays. I think Ross did the same. That's not much room to go stylized when there are so many important points that need to be hit. So, I'd say, if the essay lends itself to stylized writing and you can still hit your points, go for it, but know that for many schools' essays it will not be possible to deviate too much from the standard essay format and still have an effective essay.