Butterflies are a favorite for many girls and women. In fact they're one of my favorite things. They're beautifully colored. They're graceful. They're fragile. Many are exotic looking. There's nothing not to like about butterflies.
If you're interested in symbolism butterflies are also full of meaning. Their metamorphosis from a caterpillar into a butterfly makes the butterfly an important symbol of change. It's also a symbol of the soul, love and rebirth. So apart from being a lovely image to have on your iPhone 5 case it's also one with beautiful symbolism.