Take a piece of paper, landscape orientation, and draw straight lines -four horizontal and four vertical lines across - they do not need to be parallel but need to make sixteen enclosed shapes.
In each shape make a set of each types of lines like ...
1 like ocean waves 2 Lines as thin as thread 3 like dots of snow 4 Like rain 5 Like grass | 6 like wood grain 7 Round like buttons 8 Like thread dotted with snow 9 like the stars shining at night | 10 Like clouds 11 Jagged as rocks 12 Lines like soft down feather 13 Like the rings in a puddle from rain drops | 14Lines that fade into the background 15 Lines the start far away and push forward 16 Lines that show something is in front and something behind |