What do I want these for you ask. Weeeeeeeell, with these you can dress up your fridge (or locker) with just about anything. Just peel and stick a bit of magnet to Barbie accessories, old jewellery or hair clips, small toys, anything really, and you have a cute, personalized magnet.
My fridge has a Barbie-sized lunchbox, Hello Kitty Shrinky-Dinks, a tiny guitar, and small wooden garden tools to hold photos and my shopping list.
I suggest hitting the thrift shop for vintage kid's hair things, brooches, Barbie shoes, puzzle pieces, board game bits (Scrabble tiles to spell out messages?), or buttons.