The great thing about Android is the freedom to change pretty much anything you want with the OS. You can change your launcher, you can change your keyboard, and you really have the freedom and liberty to make your device suite your style and needs exactly. Theme developer "Pecco" has released a clean theme for the Galaxy S6 dialer. ExDialer Green Theme adds a touch of green to the dialer, and is pretty simple to install. Just install the app. Then go to menu, preferences, theme to apply it. Grab this theme from the play store link below.
via Play Store