A simple magnetic knife holder could do wonders in a children's room when it comes to holding metal items. Although many cars are no longer die cast, we're willing to bet that you have several floating around that are. These strips can be found at most kitchen and bath stores but in our experience are cheapest at IKEA.
Stripe them around a room or just make a small strip of them by an art table, no matter what it's sure to be fun and help kids pick and choose what toys they want on display! Small magnets might also be able to be attached to certain toys (for children old enough to not chew them off), to help them be displayed in the same manner.
(Image: Style Files)