DLTK's Holiday Crafts for Kids
Pet Rock Grad Craft

Include with a little note like "Kindergarten Rocks!" or "School Rocks!"

When choosing your rock, imagine what an egg carton cup cap will look like on top of it and pick a rock that's big enough to add eyes and the cap. Ours was about the size of a baseball, but an oval shape.
Brush dust off the rock with a rag.
Paint rock in an appropriate color... personally, I'd make it a contrasting color from the cap so it shows up better, but my 5 year old wanted it the same color and who am I to argue *grin* (I always have to resist the temptation to be too controlling at craft time!).
Let dry.
Prepare your cap (see below) and glue it to the top of your pet rock.
Glue on wiggly eyes.
Optional: Cut out feet shapes from fun foam and glue to bottom of rock. I couldn't do a template for this as the rocks will be all different shapes and sizes, but feet can be shaped something like:

craft instructions or

Make egg carton grad cap for your pet rock

Cut a 5" square from cardboard or poster board (adult help may be needed for this step).
Cut one cup from an egg carton (adult help may be needed for this step).
Paint egg carton and both sides of cardboard in color of your choice.
Let dry.
Position egg carton upside down and glue cardboard on the top.
Optional: Make a tassel with wool:
wrap a piece of wool around three fingers or so or a piece of cardboard 5 to 10 times (we're making a small tassel).
Tie a long piece of wool (about 6") through the loop.
remove wool from base and tie a piece of wool around the loop you've made about 1/4" down from the top.
Snip the ends at the bottom to form the tassel.
Staple or tape the tassel to the cap.