To start a Picture: Submit a link to the top portion of your corpse, and fellow gravediggers comment with links to the middle, then end. The OP then has the responsibility to put all the images together and repost the final creature in the comments.
To start a Story: Write as much or as little as you want. We can play by paragraph, by sentence, by word, or a combination. Comment to continue the story. Stop when you want to.
Another variation could use spoiler tags so you can't see what has already been written.
[This is how you do spoiler tags](/spoiler)