Get a blank peice of paper. 

Draw a long overlapping line that begins and ends in the same place. 

Pick a space defined by the original line and fill it with parralel lines. 

Do the same in another area.  Make sure your lines go in a different direction than the first ones. 

Continue doing the same in other areas. 

Fill in all the spaces.  You can also try using different kinds of parralel lines.