The easiest, and most dueable by most, would be the LED's.
Let me put it this way... One of the first post I made on this site was to a guy that was doing this with LED's. That was a long time ago. Not that it can't be done, just not in a way that looks good.
Are there things that can be done? Hell ya! But, you have to understand the main theme behind most of the people around these parts. I will give you an example...
When my wife and I was looking for a used car, I had my eye's set on a 99 Honda Accord w/V6. Why? Not so much because of reliablity, but because of all the "stuff" I could do to it!
Go forward about three weeks. We find the Mercury Mystique that we own now. There was something about the essence of this car that grabed us and "no matter the price", in my mind, I had to have this car! Although we got a great deal on the car, at the time, after we got it home... we told ourselves that there was nothing we "wanted" to do to it. It was perfect!
In comes the "Fast and the Furious" & "Flash and the Fancy" days of hotrodding around this same time.
It was then that I found this site, because of a friend of mine that asked me, "Can you do that to your car?". I told him that I didn't need to, but that I would check into it. It was at that time that I found this site. After finding this site, I could not tell you how deep of a breath a took! I didn't have a car that needed a body kit to look good. I didn't have a car that needed $1000 in suspension mods to make it handle great. I had a car that, all alone, was "Wonderful"!
Now, with all that said... Do you really need that rear reflector to light up to set your car off from everything else on the road?
My Mystique has been turning heads, in my area, for going on three years now and I have only lowered it and put a Flowmaster 40 series muffler on it. I did not change my rear reflector to turn heads, I did because I wanted to. And that was based on the fact that I was going to be replacing it soon.
We should all be proud owners of an awsome car that has awsome potential. If you can love that, then you only have your reflection in the paint job to thank. And as far as I am concerned, as long as you keep the above "feelings" in check - you can do anything to Contour and make it look great!
Keep the love of the car real in your mind and let your imagination take over. That way, you will stay true to the Contour. And that is what it is all about.
Just my two cents!