Recently I added some LEDs behind the grill pieces on the Jeep. They were wired in with the main lights, so anytime they are active, the lights are on.
Allen, a mechanic at Midas was able to do the electrical, then I did the drilling and mounting:
I used a piece of aluminum to mount to the plastic piece on the hood to give it a big enough lip to attach the LEDs
Painted the aluminum piece black, attached the LED cubes, taped up the wires in the back
Lastly, I added a cut strip of kitchen light paneling to help disperse the light, and to protect the LED cubes from wind/rain/dirt. This is the one area I'm not sure how well it'll hold up, but it works for now!