Here's an imaginative but simple & cheap kids project that fosters both creativity AND solar insights-ideal for 8-10 year olds! It's based around a ~$2 tube style solar garden lamp and blown out egg shell.
Step 1: Solar Easter Egg Lamp
The basic of the Instructable involves decorating a carefully emptied egg shell, then placing it over an up-ended solar garden lamp base. The effect in the dark is MAGICAL, & a suprising ammount of light is produced. It's ideal for kids bedside lamps, as parts & electrics are completely safe. The lamp's internal NiMH (Nickel Metal Hydrid) battery will run for several hours, and readily recharges when the solar cell is exposed to the sun.