I quickly did this today.
I placed big blobs of water on the paper with a brush then first dropped in a lemon yellow.
Placed more blobs of water, large and small, dropped in quin. violet.
Used a brush to connect the dots and let the paint run.
Then flicked warm and cool greens along with pthalo blue, sprayed lightly some areas with a mister.
Next, I used a thin brush to put in quin. burnt orange in zig zaggy lines.
Last, I placed saran wrap on it and placed a book on it.
Let it dry for just a few minutes and lifted. Once the paint and paper were thoroughly dry I added touches of Quin. Gold and darkened areas. I see a couple of fish, a couple of figures and even a mermaid possibly. Such a fun way to paint!
Then I cropped the painting using photo imagining software.