On a slightly different note, I started making birthday cakes from scratch a few years ago, and it became a tradition. We are having great fun making cakes as a family, and the surprised one is usually quite happy with the result!
For this Alien cake, we used 5 chocolate cakes, plus lots of buttercream icing! It was a huge success with 14-15 years old.
I have to add that the folder at the back ground was made by Foglia viola. I sent this very gifted crafter a sketch made by my daughter, and she turned it into a work of art, in a shape of a folder!