For a start I should try measuring their output, generally solar calculators work on extremely low power - and the panels are correspondingly low outputs.
You can run a LF pic from such a cell.
But then again, since there is only enough current for the pic, and not for other circuitry it becomes pretty useless (a pic on it's own hardly does something usefull :lol: )
there are many minature robotics people who use these cell, they charge up a capacitor and discharge through a pager vibration motor, examples are light following robots, be warned though - they walk extremly slowly!!! :?