How to set black keyboard iOS 7?

Id be happier with my iphone 4 if I were able to DOWNGRADE to iOS 6. I truly dislike the new design, its difficult to see and read and it looks really plain. It has no contrast, just a bunch of saturating flat colors.

Since, I cannot downgrade to iOS 6, and im having a difficult time reading and adapting to all the whiteness, I wonder why we cant get an option to get a black keyboard just like the one that appears when "searching", or maybe the entire phone buttons and menu. I think It always should be black, and im pretty sure most people will agree on that.

It's easier to apple to give us at least the second option on the next upgrade. And certainly easier for users to read.