Here is a cute notebook I made with a "sound of music" record I got at the thrift shop for 25 cents.
I heated the record over an electric burner and then cut the edges with a heavy duty paper trimmer. (Wear an oven mit when you do this. I heated one edge at a time. ) It makes a nice clean edge.
I used a dremel tool to make holes on the sides and also put in some eyelets. The back is the front cover of the record trimmed to the same size. I made the holes kind of small so I used twine to hold the covers and paper together. I have some binder rings for the next one.
I also used some fine sandpaper on the edges to get nice smooth, non-sharp edges. Easy-peasy :-)