Painter's tape to mark out parking places for outdoor toys. It would teach kids to put things where they belong- and you'd have accountability (easy to see who didn't do their job) From "Organizing Concepts for Kids: Garage Toys"
Organization Inspiration: Ideas for Efficient Kids' Closets
Children's Closets - hanging space needed for pants, shirts, winter jackets. Racks for board games, gifts. Drawers for socks etc. Lower shelves for blankets, bed sheets etc. School essentials in the right closet.