Installing Ambient Lighting

[Kuro3]

Ok so I have been thinking about this for a while, but I don't know much about wiring or anything like that. I love how in cars like acura, bmw, and audis have this ambient lighting that comes from the dome lights or the rearview mirror and casts a glow on the car's interior when the headlights are on. I want to instal something similar on my Mazda 3.

Anybody know, how the wiring might work for this or has anybody done anything similar? I have blue led's for my map and rear dome lights, but they are too bright. I was just thinking of getting a somewhat weak, small blue led to stick in the overhead dome lights, but I want to wire them to the lights, and I don't know how to go about it.

Thanks

The attachment on the left is the mazda3 dome light area I was talking about

The attachment on the right is one off an acura tsx that has a single led for ambient lighting

 

[MadOzodi]

How about installing a brighter bulb in the light above the ashtray? I noticed I had a little bit of blue ambient light the other night while driving in the pouring rain.

 

[Kuro3]

The only thing about that is that it only really illuminates the asktray and the shift knob. I kinda wanted an light ambient glow in the cabin.