Select the object from which you wish to make a rubbing. Try to find an object with a flat back and a raised surface on the top. This makes it easier to make your rubbing.
Lay the textured object on a flat work surface with the textured side up.
Secure the map to the textured object with masking tape. Make sure that the top, bottom and sides are taped down so the map does not move during rubbing.
Color the map using crayons in the hue of your choice. Use a light touch in horizontal motions. Switch to vertical strokes to capture every angle of the textured object's surface.
Rub over the map in crayon with increased pressure to bring out the details of the textured object.
Remove the map from the textured object by carefully lifting the tape.