Meat Tray Block Prints Spider Web

This activity is more appropriate for school aged children.
Take a foam meat tray and trim the curved edges off of it making it flat. 
Have the children take a pencil and etch a spider web on it.  If the children
choose they can add a spider or fly.  Have the children paint over the design
with white paint.  Have them lay a piece of black construction paper over the painted tray and press.  Carefully lift the paper off and they will Have a beautiful print.