Some ideas for square wedding cakes include adding cascading flowers down the side and wrapping each tier with a ribbon design around the sides. This ribbon design can have a variety of patterns, including flowers or polka dots. A square wedding cake also lends itself to a design that reflects modern art. Such a cake has patterns of rectangles of various sizes and colors.
A square cake can also be covered with chocolate shavings, creating a cake with a look reminiscent of a truffle. Another interesting idea is to decorate the cake in one color with raised letters that are the same color as the cake. On one tier, the letters spelling out the word "love" are placed in a different color from the cake, allowing the word to be prominent.
A stained glass pattern or lace patterns are other ideas for decorating a square cake. When adjusting the geometry of the cake, a dramatic twist is to place the smallest tier at the bottom of the cake. The geometry of that cake can then be further explored by adding chocolate and pastillage circular accents.
Another cake that explores the square shape has three dimensional rings coming up one corner of the cake. Visual interest is added by having the rings hang above the lip or each tier.