I like this idea, but I think the "step" shelves need some more support. Garage shelving idea: the lower shelves actually glide out so you can step to reach top shelved items. Then they slide back to the wall.
DIY IKEA Hacks for Kids' Rooms: GRUNDTAL magnetic knife rack repurposed as a wall storage for toy cars.Ikea magnetic knife rack for car storage. Keeps the favorites handy and off the floor (saving my bare feet in the dark).