A little update:
Interior lamps are from my local autostore. Pretty nice, lots of LEDs and very bright. Blue/white-ish looking. As for the license plate, did the trick with resistors on each bulb (150 Ohms) on Lucid Leds. Purple/white-ish looking.. kinda matches the front DRL LEDs I supposed.
I can't wait till it's night time so I can take pictures of how they would look like in the dark. :D