Patterns - doodling, tangling

I enjoy doodling and if I have a quad pad in front of me, it usually ends up looking like this:

Lynn Whipple's lesson for part 2 of Year of the Spark has an element of pattern making.  For the class assignment - I began with some color:

Pattern 1

Pattern 2

  

For the third pattern page, random doodling and tangling with some shading and no color:

Pattern 3

Pattern-making is relaxing.  When I put away my paper and pen, I have created some backgrounds that may be useful or if nothing else... collage fodder :-)