Open an image as described previously in 1.2 "Open image and Apply Random Style", switch from Projects to the Style Browser on the right, and Select a style. (e.g. Building Blocks/Simple Styles/Random Painter). There are three methods for applying the selected style to the image:
• Press “Enter” on the selected style
• Double-click the selected style
• Drag and drop the selected style directly onto the layer. The layer will be highlighted.
The style's name is displayed automatically in the Layer Browser. For complex styles that require a few seconds for application, you will see the processing occur in the Compositing viewport and in the Rendering Preview progress bar. You may cancel the processing at any time if you do not like the resulting effect, or if you want to try another style by clicking the Abort button, or the Esc key.
The result with the Random Painter applied will be the following:
Select the layer in the Layer Browser, and switch to the “Properties + Preview” pane. If the style has exported properties adjust the property that you want to modify by dragging the slider to the desired value. The resulting image will be rendered in real time in the Preview window and then in the Compositing viewport.

The result of this render will be:

With a few other modifications of the properties, changing the Brush family, and the brushes family you can obtain several different results:
Select the Object and modify its properties by dragging the sliders if needed. Raising the Gamma or the Contrast can give very interesting results. In the Preview pane, the Object will be updated and then the resulting image is rendered. (see tutorial about 2.X Adjusting result image properties)