This is a simple tweak in which your keyboard color and background keeps changing constantly according to the apps you are using currently.
This tweak colorize your keyboard base on the dominant color of the apps icon that you are in. For example, when you are using Facebook the keyboard color changes to blue, when you are using YouTube it changes to red and when you are using Whatsapp it changes to green. As you can see, the keyboard colors is base on your app icons.
This tweak is very simple and aesthetic and adds new spice to your keyboard. Those who have installed BlueBoard tweak need to be noted that you need to disable it as it will display the keyboard color as blue (thats the color this tweak chooses) and the background will get adjusted to that of the app’s icon color. In order to have a smooth experience, it is in your best interest to disable the BlueBoard tweak.
If you want to give this tweak a try ,I am sure you will enjoy it, it is available on Cydia for $0.99. This tweak requires iOS 7 installed.