photo via Martha Stewart Weddings
For brides that are looking for something vintage and unique, who would like to have a groom's cake, and are planning on having favors - this accomplishes all of that! Slip a note in the boxes explaining the tradition to your guests, and to save on the cake cutting fee that many venues have, simply cut the cake prior to the wedding and put into the boxes. From Martha Stewart Weddings: "Assembled in the shape of a three-tier layer cake, store-bought boxes hold individual slices of the groom's cake, ready for the guests to take home; tucked between the white boxes are ranunculuses, sweet peas, hyancinths, and lilies of the valley."
Read more at Marthastewartweddings.com: White Favors: Boxed Groom's Cake
Here's some good resources for cake slice boxes: Assorted colors/finishes - Bayley's Boxes (wholesale and bulk pricing), and white quilted - WeddingFavors.com.
And some great resources for vintage wedding traditions: Your Vintage Wedding by Nancy Eaton and Vintage Weddings by Daniela Turudich