I have seen a few people do this, and have always wanted to give it ago myself- so I have!
It's basically mini magnetic bunting, and it's a doddle to make (plus quite fun too!) All you need is some printable magnetic paper, some pattern designs ready to print, and then a pair of scissors to cut them out- Simples :)
I am not going to be selling these full time, as I know there are people out there who already do this, and do it much better then me- I just wanted to give it a go! And now I have!
I can see my friends and family getting many a pack of these!