Coffee Rocks

We made rocks out of coffee grinds today.  Add some salt, flour, water, and sand (stolen from the playground down the street - shhhhh), mix it all together, and roll it into a ball.

Oh, and hide a toy inside the ball so you can crack the thing open in a couple of days, and discover the toy that you hid.  The most random after-school activity in the history of the universe.