I found a nice project on Kickstarter.com, Ingocraft 3D printable construction kit and 3D modeling App.

The Ingocraft construction set combines hands on making with a fun 3D modeling app, and is 3D printable for customizing your kit.

I really like the approach of having an App to learn designing, an out of the box toolkit ready to play and 3D printable objects to extend the kit based on experience and needs.

I think this is really great for kids to learn!ingocraft