Radical, I was thinking the same thing about the person who caught (or was hit by) Gaudio's racquet...
Venus and Serena also had all black racquets for a year or so, several years ago, when they were first beginning to win.
Courier, as well.
But these are not examples of pro tennis players with an abundance of integrity - no, these players merely wanted more money than the racquet companies were willing to pay them. Painting the racquets all black was simply their way of protesting against the racquet companies who refused to feed their degree of greed.
I'd love to see a current player come out on court with a frame from 8 or 10 years ago - like a Pro Tour 280, or something similar.