I recently participated in the AusTangles 2021 Event on FB.  

The event took place from January 20th - January 31rst, 2021

There are fantastic bits of info about each tangle designer for the event.

https://www.facebook.com/groups/1213488015473812

The goal was to do a Zentangle a day for 12 days, the tangles were provided, and you could do them as you pleased. 

Here is My Bitty Bookz with my AusTangles.

The cover is a gorgeous cotton quilting fabric, and medium weight chipboard.  The spine is as well.  The Metal book plate is gorgeous and so easy to add.  Pages are Canson XL 140lb watercolor paper stenciled with an oxide ink pad.  The tangles are drawn on kraft colored cardstock from Michaels and I cannot tell you just how much I LOVE LOVE LOVE that cardstock.  It has a fantastic weight and texture, and the color is just perfect. 
Don't tell anyone, but I "might" have bought 24 packs of it.. lol   The last page has had pockets added with printouts of the prompts for each day.