Well, if this igloo doesn't beat them all. Build an adorable, functional, and very "green" space for the kids by recycling milk jugs. If you start saving now, you could have a substantial structure by next winter!
Flickr user Tombritt took this photo in a teacher's classroom in 2007, and we can't believe this idea didn't take off back then. While we've seen several mentioned as projects for elementary school classrooms, it seems like a great project for the backyard, too. In the process of gathering supplies, kids can learn about planning a project and exercising patience to see it through.
What do you think? Would you DIY an igloo to recycle milk jugs?
(Image: Flickr user Tombritt; used with permission)