MAKE's 3D Printing Book for Kids: LEO the Maker Prince
Perhaps the first book on 3D printing written for kids, author Carla Diana's 'LEO the Maker Prince' is cool for another reason: All of the objects featured in the book are hanging out on Thingiverse awaiting your free download. | MAKE
Barefoot Running To The Next Level: Nike Footstickers. Looks interesting and would definitely be cheaper than running shoes.
LEGO iPhone5 Case by areeve20 - Thingiverse. I just wish there were more android cases available like this.