Ambient Interior Lights
A few pics on what I have done. Basically tapped into the wires coming from the dimmer switch so they all dim with the rest of the lights. Used scotch locks to safely tap into the cables as shown here, grey blue positive, brown negative >>
I then used that power source to hook up a few prism LEDs and SMD LED strips for under the climate control section to light up the cup holders and a mess of cables!
I took off the door handle trim and tapped into the window switch as they have a light power source as well so the door bins have a bit of light which is useful at night to see what crap is stored in them etc. You can see the three tiny LEDs in the far left of the picture for the passenger door bin in the picture below.
I was in a funny mood and was looking for more places to put lights, nothing like over doing it, so I put some more SMD LED stips under the front seats for the rear footwells, worked out quite well.
Here are the products I used:
15 SMD LED Strip Light x4
Prism Micro LED Lights
Prism Door Handle Lighting Kit x2