My advice is to paint the bulbs that are in the climate control, ashtray, cigarette lighter and cruise control with glass paint. You can buy small bottles at your local craft store.
There is a film on the back of all the buttons that causes the clear light to glow the green color that you normally see, and it may darken the color produced by the bulbs that you paint.
There is also a guide on removing this film, but I wouldn't recommend it, becase it's very easy to mess up your buttons! It's somewhere on geocities, and there is a thread about it on the forums ...