For the last three months I have participated in an online zen art challenge. I didn't keep up as well this month as I did in July and August, so I found myself playing "catch up" today. I did the watercolor on the paper before doing the daily drawings, then tried to fit some of the "tangles" into the colored spots of the watercolor. I like how a unique piece of art unfolds as each daily drawing is added.
If you think you'd enjoy doing this, check out the Facebook group called Mindful Creativity with Tangles. It's a closed group so you will have to request to join. Though this looks complicated, it's very relaxing. You can do the designs at your own pace and in your own way. There is no right or wrong way. It's just a way to relax and have fun!