pj22 - I personally wouldn't try the Winbeckler's mold for the cake shown below. What you are showing is "birch bark" which is rather white-ish and smooth. The one I did was I guess pine bark (not sure other than it looked like a tree ) which is much more rugged and distressed. My daughter initially wanted the birch bark but since she changed her mind, I never got started. What I was planning to do was finish the cake in chocolate ganache then "paint" it in diluted white (or ivory - something along those lines) with a very stiff bristle-type brush. In theory, this ought to work, but I have no personal experience to say that it did or didn't. To make the carvings, I planned to dip a ball tool in hot water, dry it off, and carve. For the knot holes, I planned to form them out of the same chocolate ganache and paint them with the same white. However, since I can't give personal testimony to if my idea would have worked or not, I would encourage you to take some time and peruse around Cake Central searching for anything related to Birch Bark tutorials, forums, and posts. I know I did this myself and found lots of great examples and ideas. PS: If you aren't familiar with the paint technique I'm describing, use vodka or a clear similar alcohol or a clear extract of some kind to thin either an icing color and/or a matte luster dust. If you use water, you will ruin your icing no matter what kind of icing you use. Alcohol or extract is very important because it will evaporate quickly and not ruin your icing. You can use a colored extract (or alcohol for that matter) and it won't hurt your icing but it will affect the color(s) you are using, so that's why to stick with clear. I'm glad to answer any questions, but if you want birch bark (which is gorgeous), you'll need a different technique than the one I used. Good luck and Happy Baking!!