Even if you haven't bought a CD or DVD in years, you probably still have hundreds of them around the house. When it comes time to move them, if you're short a few jewel cases, a large book can get the job done in a pinch.
This is about as simple as it gets, but it really can come in handy to keep your discs from getting scratched. All you have to do is slide the loose CDs into the pages of the book, and possibly wrap a rubber band around the cover for some extra tension. The book will keep your discs from getting lost or separated, and the paper will protect them from any needless scratches. This definitely isn't a permanent solution for storing old CDs, but it works well if you're moving, or if you just want to keep a few in your car without buying a CD holder.
Hold CDs with a Book [Instructables]