Can you do watercolor in Illustrator?
By default, Adobe Illustrator comes with its own pack of watercolor brushes, which can be accessed from within the Brushes panel.
How do you make a color splash in Illustrator?
Step 1. Select your red compound path and click the New Brush button from the Brushes panel (Window > Brushes). Check the Scatter Brush box and click OK. Enter all the attributes shown in the following image, click OK, and you've got your paint splatter Illustrator brush.