I think I have seen others do something similar. I normally do not take my blades out except to clean, dry, and replace, but I decided that this would be useful to me. I had purchased a pack of magnetic buttons a while back. I retrieved two of them and put them inside the door of my medicine cabinet. Now, I have a place for my current DE and SE blades. Since I like to use the carbon steel SE blades this is going to be very good for me.
I take old magnetic business cards off the fridge , turn them around and put some double sided tape on them and stick the card on the side wall in bathroom : then put blades that I will use again on the magnetic side of thecard. Slide them off to reuse them. Keeps them out of way, dry, and ready to use.