Changing appearance of keyboard on iphone? - 1

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?
But it was in his safari not just a secure apple form.
And it wasn't swiftkey. That only allows you to make grammar corrections.

The only dark keyboard I know of on iPhone was before iOS7 (the keyboard background was darker) and then on iOS7 only when searching the iPhone.
The only way I can think of that turns your keyboard black is by inverting colours (Settings - General - Accessibility - Invert Colours) but that changes the appearance of the phone completely.

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