Sometimes, cake decorating is all about function instead of form. In other words, it's not about which elements you decide to add -- it's how the elements add up to create a theme. A skewed topper transforms a wedding cake into a divorce cake. Different colors of cupcake can act like pixels or dots: Combine them to make characters from old video games, like "Super Mario Bros." Want to go a little dressier? Put a plain, rectangular cake into a box and use icing and decorations to turn it into a man's folded dress shirt, complete with a tie. Themes like this are becoming more popular at weddings, as couples opt for more personalized wedding cakes.