These were SO much fun!  I first saw the idea of making hot rocks at the Crafty Crow.  Since we just happened to be doing the rocks and minerals section of our earth science unit, the craft fit in perfectly.  The rocks turned out so well, we entered them in the craft division of our co-op's expo. 

You can find the original directions at Wise Craft, but put very simply - heat rocks in the oven at 350 for 15 minutes.  While you wait, peel the paper from several crayon colors.  After 15 minutes, you place the crayons on the hot rocks and create your masterpieces.

I placed aluminum foil on the pan, so when the pan came out of the oven, we gathered around it, used old oven mitts to steady the rocks and went to town. 

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My BFF, Melissa, recently posted about tempera monoprint art.  This was another fun project that turned out so well we entered it in the printing division of the expo.  I won't bother with directions, hers are great!