Working on Black Zentangle tiles has proven to be a lot of fun. Discovering what pens will work best has been a journey with unexpected surprises. What has worked best for me is using a variety of pens and using a layered approach. These are some examples of tiles created using a variety of white pens, white and colored pencils, as well as metallic markers. Although first disappointed that the white pens did not respond to the black tiles in the same manner that the black pens respond to the white tiles, by taking the time to play at this, not work at it, the black tiles are now an enriching "zen" experience with endless possibilities!