Here's an example - basically almost no brushwork involved - just squirting paint on wet illustration board and watching as the paint and the water play.
After it dries I look at it right side up, upside down, sideways until I think I know what the painting wants to be, then I try to help it to be that.
I used a hotel card key to scoop up paint and slather it on, a Mr. Clean sponge to lift paint, and did a little scraping with an x-acto blade.
Crazy fun - it appeals to my wild side.
Yes, I do have one.