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Here's a fun tutorial on how to make a message bangle that's one-of-a-kind, done in the sun, waterproof and weatherproof.
I finally gave in and made marble magnets.
The principle is simple and seductively clever: solar lights that store energy during the day and release light at night. These can be purchased ready-made in a variety of colors (yellow, blue and red) but they can also be built at home . A simple, less-technical approach involves buying a conventional solar-powered yard lamp and then essentially harvesting it for key pieces to put in a jar.
If interested, I answered a few interview questions with Simply Modern Mom here .