If you mean the real buttons, like on the unit itself, not on the touchscreen, then they can't be changed unless you want to open up the unit and swap out every LED.
Supposedly on the D3 you can change the color of the buttons, so thats a good sign that in the future (N4, Z2) you should be able to change the buttons.
You can 2 change the color of the buttons you just have to get a magic marker. Sorry couldn't resist. Actually got into an arguement with a customer about the same thing. He said he could change the color that way and his friend did it with an n1.
You mean, like color the face of the button with a Sharpie? That's gotta be attractive. :shock:
Yeahhis "friend" came by today I guess to try and gloat to show it was possible. Let me tell you it looked like crap, and we and another customer told him that. To each his own I guess.