Pro: Your rainbow cake doesn't taste like chemicals. Con: Your rainbow cake tastes like vegetables. Oh well, still pretty!
I was always that jerk kid who dug out the whole strawberry stripe of the Neapolitan ice cream in the leaky cardboard box. I kind of miss those crappy boxes that were impossible to open without ripping the lid and you could never get them closed again and would inevitably end up with a puddle of freezer-burned nasty ice cream. Those were the days. Kids these days have it so easy.
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