Although the idea for the sketch seems simplistic, the piping sure was not! In order to get the level of detail in the invitation I would use a royal icing and invert the pattern. To top it off, we made a custom "AR" topper with intertwining lines as their monogram. For gay couples and couples where the bride is not taking the grooms last name I recommend using the first name initials for the monogram. It keeps the traditional feel of a monogram, but customized to the modern couple!
An voila, our detailed modern Tiffany Tile pattern cake.