Choose your own picture as background of a button

I would like a option to choose a image as a background of a button. Now you can only choose a text and/or a icon.
Example: I would like to create buttons for radio stations. Instead of a button with and icon and some text i can create a logo of the radio station.
That way you have more flexibility with the layout how the screen looks and especially on smaller screen it a picture is easier to read then text/