Batman loves unicorns and rainbows. Everyone knows that!
I love a repeating pattern, especially on food. Even better when it's done with something as delicious and natural as blueberries. Nothing fussy, no artificial coloring or hours slaving over perfectly smooth icing, just a fantastic and undoubtedly delicious polka dotted tower of celebration. I'll toast to that!
Source: Poires au Chocolat http://www.poiresauchocolat.net/2010/04/blueberry-and-ginger-layer-cake.html