This is a humorous computer themed cake. It is a birthday cake for a computer guy. He loves Linux and doesn't care for Windows. For those of you not familiar with Linux, Tux is the Linux penguin and their logo.
Tux was made with modeling chocolate and the toilet paper roll and stand are gumpaste. The rest is decorated with fondant. The cake is white and chocolate (so when you slice it you get both in each slice). The frosting is a toffee buttercream.