The colorful cardboard bookmarks and paper clips by Japanese brand Pyloneer are made for your convenience. The P-hook bookmark is a hook-like design that has a finger hole so that you can easily fish out books on a shelf. The DARUMA clip, which resembles the shape crop circles, also has holes that you can hook your finger in.
The P-hook is particularly interesting because it's a bookmark that visibly protrudes from the pages of the book. The circular design makes it easy to indicate which book you've read up to where. It is shaped so that it will stay put as a bookmark inside the book, even when you're pulling the finger tab off the shelf.
Both products are made of paper, however are highly durable. The DURAMA clip and P-hook are both shaped so that you can store them hanging on a hook or on a cork board.