Reddit mentions of U Mold Plastic Molding Kit, Ideal for repairs, crafts and prototyping, can be colored using dye pellets

You'll want to use something other than the built in webcam you have. The quality of tracking you'll get is dependent on your camera's frames per second and a smaller amount on it's resolution. Currently the best camera I know of is a PS3 Eye. It can pull off 60+ fps at 640x480 which will give you amazing performance. Be aware that there are two different lenses on them and only one of them can have the IR filter removed. The camera itself can be picked up used for about $9 US.

After that you'll need a point model. This is one I built for a friend that runs off 2 AAA batteries. Another option is to power by USB but the wiring comes out different and you'll want to add a fuse to it so you don't accidentally fry your motherboard. They can be built out of anything you can get your hands on. If you want some inspiration you can check the three point models from here. Bic pen tubes seem to be very popular as the LED can sit at the end and the wiring goes in the tube. Personally I build mine out of this stuff. As for the LEDs you can either find ones that have a very high viewing angle (best I ever found here) or add a diffuser to the end. I would highly recommend using a diffuser as the LEDs will cause a huge bloom when aimed directly at the camera without them. The plastic I use to build mine happens to make an exceptional diffuser.

For the software you already have one of the two options. FaceTrackNoIR, the one I use, or you can use the successor to it OpenTrack. I use FaceTrack because it seems to be a bit quicker. For both you'll end up using the built in point tracker.

As for performance it works very well. Here is a video of me using it.