Toy cars are like potato chips - you can't just have one. In fact, it seems like you can't even have less than a few dozen. My son inherited a bunch from his father which are unceremoniously living in a little suitcase. But I do love these diy ideas which not only house, but also display toy car collections.
1. Magnetic strips: The Land of Nod recently featured this car image in their catalog and added some instructions about how to make it on their blog using long magnetic strips. It's similar to the idea of using magnetic knife strips, but on a much greater scale. They warn that some newer cars don't have enough actual metal to attach magntically so you should test yours before investing in this project. See more: Honest to Nod
2. Picture Ledges: Interior Designer Lacey Carroll did a playroom makeover for a client whose son had lots of toy cars. She decided to display and store them using picture ledges. See more: Lacey Carroll Interiors
3. Hanging Organizer: Chris who blogs at Pick Up Some Creativity created this hanging car organizer. It's similar to a hanging shoe organizer, but with smaller pockets sized for cars. Of course, you could also just purchase a shoe organizer and put multiple cars in each pocket. See more: Pick Up Some Creativity
4. Open Shelf: A dad at Lumberjocks built his own open shelf to hold about a hundred of his son's toy cars. He used poplar and walnut wood and tilted each shelf slightly to make the unit as much a display piece as for storage. See more: Lumberjocks
5. Paper Tubes: This idea, at Family Fun, is clever but perhaps not as sturdy as the other ideas since the paper tubes are held together with glue. It looks like they used some heavy duty paper tubes, but you could also try empty toilet paper rolls. See more: Family Fun