Bored of
having the same white keyboard in every application? Well you need not to worry
now.
 AdaptiveKeyboard calculates dominant color from the application icon and uses it as the keyboard’s color 
A new tweak is
available in Cydia called “AdaptiveKeyboard” which changes the color of the
keyboard in every application. You do not need to set color for individual app.
AdaptiveKeyboard calculates dominant color from the application icon and uses
it as the keyboard’s color. For example you will get a purple keyboard in viber
because the icon of the viber is purple, you will get blue keyboard on Facebook
because the icon of the Facebook is blue and so on. So basically every app will
get its own keyboard color by matching the app icon color.
How to Install
AdaptiveKeyboard Color
To install
this tweak, your device needs to be Jailbroken. Click here to jailbreak your device(available only for iOS 9-9.1)
  • Simply Launch Cydia –
    Tap on Search and type the name of the Cydia tweak AdaptiveKeyboard and
    Tap install. 
  • Respring your
    device because the tweaks may not work properly if you do
    not respring or reboot your device. 

Now you will
be able to see various colors of keyboard for various apps on your device. You
can get this tweak on ModMyi repo.