My friend and I even got in on the fun. I traced her, then she traced me.
To make homemade chalk-
1/4 cup plaster of paris
2 T water
tempra paint or food coloring (til color is to your liking)
Grease inside of plastic eggs with vaseline, using extra at edges. Put the halves in an empty egg carton. Mix plaster of paris, water, and paint or food coloring (although the color comes off a bit more on your hands with food coloring). When mixed pour into greases egg halves almost to the top. Allow to set up for a few minutes, then put them together and shake to combine. Let them set up for 24 hours, then open the eggs. You may need to use a knife to get in the crack to open eggs.