It feels like Lego should still have a Return of the King wave in their The Lord of the Rings theme. People all over the internet would like to have an official Minis Tirith, Barad-dûr, Witch-king of Angmar, or a Mount Doom set. Graham Gidman has proposed what the missing Mount Doom set would look like. His Mount Doom (79022) would be priced at $24.99 and come in at 201 pieces. Everything about this MOC looks like it could be an official Lego set. It even features the stupid little catapult that most fantasy set have. Poor little Lego Frodo, he doesn’t know that Gollum is going to bite his finger off. And, poor little Gollum, he is about to fall to his doom.
This Lego Mount Doom was built for the Category A: The Missing Set challenge over on Eurobricks: http://www.eurobricks.com/forum/index.php?showtopic=101920&st=0#entry2043548