If you're lucky enough to have an iOS developer account, then you had a brief glimpse of some of the darker options with the 7.1 update, including a darker keyboard. This was exclusive to developers who installed the first iOS 7.1 beta, but is no longer available, unfortunately.
For those of us that don't have an extra $100 to drop on a developer account, there is a way to get this dark keyboard, and not only as a preview, but as your default look. All you need is to jailbreak your iOS 7 device. Already jailbroken? Then this will be quick!
Open up Cydia, search Bloard, then install.
Easy, right? Next, go into your Settings application, locate Bloard and enable.
There's not much else to it. If you want to revert back to basic white, then just go into the Bloard settings and disable.
Easy! Enjoy the darker-look, and let us know of any trouble you run into. Check back soon as we'll be covering several more new softMods for iOS 7 over the coming weeks.