I had a customer ask me if I could make her a refrigerator pen - I see one from CSUSA, but not too excited about the style. Are there any magnetic clips out there?
You could make a pen and then put a tiny rare earth magnet on the back side. Us a tiny one and drill a hole to sink it and glue it in place. Then it will stick on a refrigerator. You can get "tiny" rare earth magnets. Or make a holder for the pen that uses a rare earth magnet to hold it to the door.