A friend in the industry told me about a really funny website last night–Cake Wrecks.
While not all of the cakes on the blog deal with weddings, there are certainly some interesting cakes on there! The two cakes you see above are from a wedding. The first image is what the bride provided, and the second image is what was delivered on the wedding day!
In short, seek out wedding pros that can not only understand your vision, but can also execute! Check references, and ask to see lots of photos–not just photos from other weddings or magazines that they say they can replicate.