To use dynamic speckles, you must choose a Dynamic Speckle dab type from the General brush control panel (Window Brush Control Panels General). For more information, see Dynamic Speckles controls.
A Flow Particle brushstroke (left) and a Dynamic Speckle Flow Particle brushstroke (right)
A Gravity Particle brushstroke (left) and a Dynamic Speckle Gravity Particle brushstroke (right)
A Spring Particle brushstroke (left) and a Dynamic Speckle Spring Particle brushstroke (right)