Tangling on the black Zentangle tiles is a different experience from using the white or tan Zentangle tiles. It means you have to think of things in a different way. But it's definitely worth the effort.
This time I was inspired by lace patterns and did a portion of a Zendala. I used white ink and my new glass dip pen. I need to play with this pen some more but when I have I'll do a blog post on it. The white areas that are softer are done using a wash that is more water than ink and applied with a paintbrush.
If you do a search for lace patterns to try this yourself, I suggest you also look for lace patterns from Arlene Linton. She is an artist and teacher with several books on the subject.