The bottom isn't magnetized...so magnets wouldn't work. You could try the tack though, although you put the whole eyeshadow pot in so you'd still have to lift the lid to use it.

I'm actually considering taking my shadows out of it because I store them in a different place than the rest of my makeup so I keep forgetting to use them. It's kind of sad. Anyway, I'd say the vault is pretty much a waste unless you really need some sort of storage for the shadows.