Well, I'd recommend getting the factory kit anyway, even if you want to use something different afterwards. The kit comes with all the wiring, and a replacement stalk for your turn signals/etc --- pull out on LH to turn on fogs. And it enables the foglight indicator on your dash.
I know that one of our members (Boeserblick) has tinted his factory fogs yellow.. other than that I dont know of anyone whose replaced the fogs with something aftermarket in the factory holes.
I got mine from MyDodgeParts.com (a jeep dealer in TX that offers discounts on the web) - p/n 82207998 $163.20 Fog Lights - Liberty 2002-2004 Liberty Fog Lights, mount in fascia, includes wiring, switch and lights.
Best of luck-
-Blu