Easy Minecraft Birthday Cake

If you have elementary-aged children, you know about Minecraft. Okay, that's not true at all. I know nothing about Minecraft, but many of my kids' friends do. And this birthday cake was for one of them.

What You Need:
Square Cake (This is two layers of 8" square)
Chocolate Ganache Icing (2 cups)
Buttercream Icing (1-2 cups) - colored dark green