http://forums.nicoclub.com/zerothread/338634

In terms of "Where to get them", ebay is my pick but I believe there are so many local shops or websites that sells them.

And in terms of "How to change them" the owner's manual covered them already.

I did all my interior lights (except "Makeup Mirror") and license plate with white LEDs. I meant to take some pics and post them here but didn't have a chance to get to it.

In short:
DOOR/MAPS/DOMES/PARKING LIGHTS/LICENSE PLATE = T10/194 bulbs
FOOT WELL = T5/74 bulbs
TRUNK= DE3175 (31mm) bulbs
Vanity= 29 mm vanity lights

Doors/maps/domes/trunk Installation was easy, just gently inserting a flathead screwdriver that was covered by a thin cloth into the light covers and popping them off.

Tricker to do:
Footwells: http://forums.nicoclub.com/zerothread?id=395554
License plate: http://forums.nicoclub.com/zerothread/338634