I decided to do a test FBCT first. I chose some Super Mario mushrooms because they are simple, have color, and have easy areas to work with. So this is what I made:
Needless to say, my friend's FBCT didn't turn out so well. Her outline and some of the colored icing peeled off with the wax paper. She used the Wilton black icing in the tube. I read in many FBCT tutorials and threads that the Wilton icing in the tube doesn't work well for this project. Some said it worked okay when they used it, but I used Betty Crocker milk chocolate icing (because coloring it black is super easy) and it worked like a dream. It froze and peeled nicely. Also, she only let her FBCT freeze for about an hour. I let mine freeze overnight to make sure it was sturdy and solid before I applied it to the cake.
Helpful videos I used:
http://www.youtube.com/watch?v=CV2DZDuv9XA - "How to do a Buttercream Transfer"
http://www.youtube.com/watch?v=ILouJOZ9I4o - "How to Decorate a Cake" from BettyCrockerTV
See these two videos plus more on my FBCT Resource page!