Door Handle Lights
 

So I'm pretty new to modding any sort of car but I'm looking to make my black 2001 C240 with Carlsson kit look a little bit more swish. I've been seeing some of the new Honda Accords around and they have some pretty nice LED lights in the exterior door handle which turn on when the car is being locked/unlocked. Has anyone done/seen this done to other cars? How hard and/or expensive would it be to do?

Cheers