My name is David Brooks and I am an independent iPhone app developer. I recently came across the idea of using the phone's keyboard as another location to have a picture, similarly to the home screen and lock screens. However, the challenge was to make it so that the user could still type while seeing their favorite picture. This is where Image Keyboard, (I know, real original name) comes into play. It allows you to take any picture, whether direct from your camera or in your photos, and set it as the background of the keyboard. Then, you get to pick any color to use as the color of the keys. It really is as simple as that!
And view it in the App Store here: https://itunes.apple.com/app/id1030737982
I hope you enjoy it!