I'm gonna get one for my iPhone just to mess with people.
I like having a charm on my phone, it gives me something to play with when I'm bored and something to "accidentally" smack people with when they're being annoying.
Carry Nyan Cat in your purse! Nyan everywhere!
Personally, I always have headphones plugged into my phone, but if I didn't, I'd gladly have a sweet little bear head.
Every day of the week deserves its own color.