All of them are so cute I want to live in one. Most of them you can make from just a couple of cardboard boxes. Perfect craft and then hours and hours of fun play for kids.
Popsicle Stick House | Step-by-Step | DIY Craft How To’s and Instructions| Martha Stewart
This lesson will involve your students in geometry and measurement as they work as civil engineers to design and build their own bridge.
Recycling at its Finest: How to Build a Magnificent Milk Jug Igloo, Creative and easy project to entertain kids.
37 Ridiculously Awesome Things To Do In Your Backyard This Summer Activities, Kid Activities, Summer Kid Activities
Project-Based Engineering for Kids - great projects from Instructables.com
Newspaper Play Structures -- kids can build & re-build them. Throw a sheet overtop for an instant reading nook. :-)
Learn how to make a geodesic dome (and sphere) out of straws and pipe cleaners
Geodesic Clubhouse best example, do 3-4 pages per roll, trim edges on both ends & punch holes to use chenille stems to connect so the parts can be reused/stored.