Ganache is a wonderfully tasty but evil thing to add to your cakes. It is essentially chocolate, heavy whipping cream and butter melted and mixed to form all sorts of fun and yummy things. I made some for two of the four layers of the topsy turvy or "mad hatter" cake I'm making for tomorrow.
Here are the four cakes (3 layers a piece). The chocolate looking ones are the ganache ones. I find it is MUCH easier to work with and get a clean (smooth) crumb coat than icing from a can.

You can see that the first layer I attempted was not quite cooled (refrigerated enough so it looks a bit, well bad...) but the other 3 layers make up for it.
Here is an example of how the cake is engineered. The bottom layer is cut so that the upper layer fits in flat. This helps keep the cake stable while proving the illusion of crookedness.

Here's what the crumb coat looks like before the cut is made.

This is the top layer covered in homemade marshmallow fondant. I still need to learn how to do this part correctly.

Here is the ganache just before being refrigerated.
I'll post photos of the finished cake tomorrow... I'm still keeping the receiver of the cake in the dark as to the final dazzling cake.