I saw this done on a Youtube video and I was impressed so I thought I would try it. Sadly I didn't bookmark the vid so I can't go back to see what happens next. It is a 2 part technique so I did it over two days.
I put a heap of heavy duty acrylic onto my canvas in two colours and white and the got my fingers into it. The idea is to develop lots of texture and then I left it to dry. Below is Day 9 development.
Day 10 and I had to rotate my canvas and do it again. Makes for very interesting fingers and anything else I touch. Then with a plastic card scrape all over to make lines. Fun and messy. What next? No idea.
Close up look at the texture created.