A gimmick maybe, but this is the latest thing in tennis rackets, and now used by the Bryan Brothers ( well they use the Speedport Black) or go here for a UK racket site

The first time that you can customize the colour of your racket, by choosing one of 6 different colours that go on the four edges of the racket, and the colour of the grip.

The idea is you go to the Prince web site and customize a racket - print it out and then go to a Prince dealer and they make it for you.

So probably not in the UK or Spain yet, but go to the site below and try it out

Customize your racket here tennis zoo rackets