Howdy Scooby I have indeed as Paul says replaced the bulbs for the blue ones as sold on ebay, look pretty smart :)
Easy to fit as well, the only problem I had was I have a replacement clock in my dash and that takes a different bulb, I have heard that you can buy special paint to cover the bulb, but as yet I haven’t looked for it.
The guy selling them on ebay does a very quick service, also comes with complete install instructions :)