This classic slide clasp comes with a blank magnet that can be used as is or creatively decorated in a style of your choosing. See images for some inspiration.
Unit: 1 set
How to attach
1) Open out the brass bars and slide them into the fabric tubes.
2) Close the brass bar. Slide down top clip and mark the position of the magnet. Make two holes with a tailors awl. Insert the magnet prongs through the holes and then through the magnet back plate.
3) Bend prongs over to secure magnet.
See example bag here