I only recently joined the site, and my first idea is drafted in the sandbox right now but before putting it up on "Drafts and Critiques" I wanted to be sure it is A, a good idea, and B, not done before.
My idea for an SCP is a standard notebook. If you write that something will happen in the note book, it is much more likely to happen.
The book does have sentience, and words will appear on the page prompting you to "write to me (it)" The book calls itself Alice, and will try and convince the reader to write certain things in the book. There is a plan for an SCP XXXX-2, who is an official owner of the book, but I'm not entirely sure if it's always been one person, or if it's is passed on. I also don't know if the owner of the book has any abilities a normal person wouldn't have. Anyways, here's my REALLY REALLY ROUGH draft for it. A lot a critique is needed so I'd appreciate opinions.
Note: Addendum not done yet. (None of the Three)
Edited that reaaaaaally long summary into here. ~Zyn