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Instrument illumination is by surface-mounted LED's on the dashboard printed circuit board. It is possible to change them for blue SMT LED's if you have the right soldering equipment and a steady hand, but they are not meant to be replaceable.
 
I to would also like to know this (sorry for hijacking) I was always fond of the Volkswagen lighting.
 
Considering they are surface mounts, I'd wager they're probably no larger than 0.5cm x 0.5 cm -- soldering them would be a pain if you're not experienced. You'd probably need one of those desk lamps with the magnifying glass bit in addition to your steady hands ;)
 
Do a search. I know this has been covered before, here for a start.

The dash will have to come right out, which is a battery-disconnect operation, so you'll need your radio code to hand.

SMT components are meant for automated assembly so replacing them by hand is not going to be a walk in the park. A small soldering iron with a fine tip, desoldering pump, tweezers, care to avoid desoldering, loosening or damaging any of the other surface-mount components and good eyesight or a magnifying glass, along with a good workbench light are recommended. As you can see, though, others have done it successfully. Good luck.