Changing appearance of keyboard on iphone?

I've been wanting to get the darker keyboard ever since i saw it on my boyfriends iphone. He never jailbroke it or anything and it isn't the new ios 7.1 update because it is gone now. I wanna know how you can get it. I know its possible but i can't find anything on it. So how do i get it?

Added (1). But it was in his safari not just a secure apple form.

Added (2). And it wasn't swiftkey. That only allows you to make grammar corrections.

Is iphone you can't modify it

I don't think thats possible i did a research and found out that the dark appearance of the keyboard is to notify the user that you are typing into a secure apple form

Correct.
Unless, Apple goes ahead and let's Swiftkey in as a keyboard option, there's no choice to customize color of Apple keyboard.

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