This was made in like 3 hours, using horrible boxed cake. Horrible because boxed cakes are way too soft/moist to hold up to sculpting, etc.
My son was turning 16. We took him to a fun dinner and he had a large birthday cupcake there, but when I asked him if he wanted a cake the next evening, he said yes. Thinking about it for a bit, I settled on a companion cube from the video game "Portal."
Again, BOXED cake and 3 hours. I wasn't putting forth a huge effort, as you can tell by its asymmetrical corners, etc.
And yet, he loved it. :)