VW's new SUV (the Touareg) comes with a little flashlight that fits in the 12 volt socket. It is a cute HID light that actually is kind of useful.
Light in the socket charging.
Okay, I have to confess.... This is by far the silliest mod that I've done to my car. The little light is dang useful, but the entire reason why I bought it was because I have changed most of the interior lights out with blue LEDs. The LEDs look amazingly cool, but they don't offer a ton of light. Its nice, particularly in the trunk to have a little flashlight to look for things.
In the socket with the lights on.
Flash photo of the light in the trunk
Non-flash photo
Non-flash with the light on.
The beam that the light puts out.