I think the interior bulbs are LEDs already. I believe the bulb replacement types are in the owners manual. I suggest taking a look there which will give you the specs for what to search for online. There is lots of online dealers for LED bulbs.
i have beeen also wanting to change the interior lights to blue.
however, cannot find the led bulb size anywhere. will probably have to go to the dealership and ask the parts department what size to use.