This last group of images is great.  I really like the way each of us translates the idea "patterns and repitition".   That means in this like other challenges, each does his or her thought on it and nothing is boring.  This is much fun indeed and yes, a challenge.

 

Paint brushes? I have done two paintings on canvas with acrylics.  The brushes are long gone as are the paintings.  My best brushes are here with me..I wash them several times a day and also use them to type this post.      Ha Ha.  Tom.