The cake is usually tasty, but sometimes the decoration is atrocious. That's why I'm not surprised there is a Web site on ugly cakes and funny cake decorating mistakes. (Thanks to Carrie for the link).
There are truly some classics there to check out, including a birthday cake for a 4-year-old that is decorated like the Grand Theft Auto game, including a guy with a gun. Lil' Derrick appears to be on his way to big things. Maybe in 15 years he'll get another cake with a nail file in it.
But my favorites are the cakes like the one pictured, where the cake artist has completely missed the concept. There's also a cake that says "Write Welcome on it."