Inpro smoked indicator lights. Completely underwhelmed by them and it's too much hassle to take them off, so they're still on.
Haha, I convinced myself there was a difference too.
My rule with modding is this:
Never (with the exception of mapping) do anything you can't reverse back to stock and get some of your money back when you're done.
I don't agree with that philosophy, it is a sensible one mind... but when you buy your car you don't instantly think about selling it on do you, you think about the miles you will be doing, and that you want to do it in your own comfort. You make the car how you like it.
(well, I did, and think that all I have done is removable)