JCrew Weddings and Parties

I was chilling in my room with nothing to do, when I realized that I hadn't yet cracked my J. Crew catalogue. Have any of you seen it? It is sooo cute (well it's jcrew, how could it not be?). They have so many fabulous dresses and ballet flats. But what I really like is their weddings and parties collections. They have long and short bridesmaid gowns, bridal gowns, and shoes. I really like the kelly green and the peacock blue ones. They had a short strapless yellow dress for $280. It's soo cute but a) it's out of my price range and b) I have nowhere to wear it b/c my school doesn't have prom, just a spring formal. It waqs in the April Teen Vogue if you wanna see it. I'm sorry I have no pictures, I couldn't find it on their website.
On a different note... the Spring Dance is coming up and I'm not quite sure what to wear. I found a floor length, strapless, turquoise dress. It was $30 at Ross. Is the cinderella look over-rated and tacky? Or is it elegant and chic?