Had a think about this and I am going to istall some blue LEDs that come on with ignition. Already run an ignition switched power supply to the fuse area will use that.
When you get in car the blue interior light comes on then when you turn the key that will fade and the footwell lights will come on. Should be a good effect dont think I will try and build a fade into the foot lights might be beyond me, but then again a capacitor and a couple of resistors???
Will do a how to when I do this.