purple lights in the ac vents

i was thinking about putting a purple led light in all of the vents of my 04 mazda6s. i dont want it to be too bright but just enough to be noticable and i was wondering if anyone has done that before and if they have any suggestions thanks.

It''s gonna be tough wiring those LEDs in there.  I had neon lights under the dash once a few cars ago and that was pretty hard to wire as well.  I had a switch for that though so they weren''t always on.