Yeah, I know, 30 isn't so old, but so what? If you're younger than the person who's turning 30 you can rub it in a little bit.
So I did a coffin with a tombstone and a beautiful graveyard scene to go with it. The coffin itself was the cake, and the scenery was made from icing, chocolate and gumpaste. I also used some chocolate branches to make it more lovely.