Paint some abstract shapes with Shape Printed brush and layer them over each other to emulate that printed look; or take the Wet Ink brush and paint the feminine, undulated shapes that Matisse is so famous for. Want to add some spontaneous paint under those lines? pick the Coloring Brush for a painted, gouache background. If you're after the less known, but still beautiful charcoal look, then go for the two different shade brushes and the good old Charcoal Pencil brush.