If you have an idea for a story that, for whichever reason you won't be using, please don't just let it float into the void. Post it here, and other people may be able to use it.
If you are going to be using an idea from The Idea Box, make sure you post to let everyone know which story you're going to work on, so that we don't end up with three versions of the same thing.
I just read the stuff about the lack of heretical books (which I didn't know) So now I have an idea for a book from a Sheogorath worshipper. The book should look like a bunch of nonsense at first sight, but should contain hidden secrets. I have skills with the 'nonsense' part, but I'm worthless in hidden messages.