At the American Visionary Art Museum I'm helping develop day-long, family-centered Maker programs called "AVAM's Big Idea Day". We had one last Sunday - the Wind Tubes were the star of the show. (Not really: the star of the day would go to the amazing, beyond amazing P. Nosa who was there "sewing big ideas" with his incredible sewing machine apparatus.)
The experience with the wind tubes was great - the making can go from simple to complex in very intuitive ways. We had lots of different kinds of materials spread around AVAM's education space, many families stayed for well over an hour, many people either made multiple objects or tinkered with a single object for the duration.
Lots of fun - think we might try Scribbling Machines for the next Big Idea Day.