I know it is a noob quesion but what is a Kentucky rig? I haven't fished for crappie in years and hope to find some this weekend for my 13 yaer old son to catch! Also what color jigs work in North Texas creeks?
Bobcat1, posted some pretty good photos of the rig. It is basically a heavy weight below a hook.
This is my favorite rig for crappie fishing. I rig it to a swivel attached to my main line. Then attach the hook and leader to the swivel. The leader and hook are the same size as you buy when you get a pack of pre-tied aberdeens. I then tie a leader to a weight and attach it to the swivel. I run my weight about 8-12" below my hook. There are many variations or ways you could tie this rig. I use a 1oz. weights.
I would recommend using minnows with the Kentucky rig. As for jig color the darker the water the darker color jig and the lighter the water the lighter colored jigs. For lighter water, white/chart are good colors. Darker water try black/pink, black/chart, black/orange, orange.
Hope this helps. Good luck and good fishing!