Before you go on: note that we only recommend that you do this with specific pieces of film that you don’t care about.
If you’ve got rolls of film scanned already, found a bit of it at a thrift/vintage store, or just have a bit of it that you don’t particularly care for anymore, then why not recycle it? Besides using them for possible window decorations, another option for you would be to cut up a strip of it and make it into bookmark. Simply take the film, surround the edges and back in paper, and then give it a bit of clear tape.
Just like that, you’ve got a brand new bookmark for your weekend reading material.