Her instructions say to use saran-wrap to get the distressed look, but I just used foil and it worked fine. When I got done the star looked funky, so I lightly outlined it with a red fabric marker, which made it look much better. And you can't really tell that it's a different color red.
Anyway, if you have never tried freezer paper stenciling anything, I highly recommend it. I would link to a tutorial for you, but there are about a zillion, just google it. It's very easy and fun. You can also do it with watered-down bleach in a spray bottle instead of fabric paint. This obviously takes the color out of the stencil. I did a couple shirts for my brothers this way a while back and it was very fun.