There are plenty of places you can go to get your consoles professionally painted. I myself have had it done on my Dreamcast and my Saturn. My Dreamcast is a cool sky blue color, and my Saturn is a forest green, complete with darker green controllers.
It is pretty expensive, however, and ultimately pointless save for the novelty factor. That being said, I also believe that this picture is simply a white Wii with gold or amber colored lights shining on it