Create a new layer: Layer ? New ? Layer and represent on it an arbitrary ornament, making use of the Pen Tool and Fill Path command:



Make a copy of this layer: Layer ? Duplicate Layer (ctrl+j) and the ornament on it should be smaller a little. Turn it around with Edit ? Free Transform (ctrl+t).



Merge down the layers: Layer ? Merge Down and start using the Shape Tool (holding the shift button) to add several standard ornaments of different sizes (in this case we'll add the circles).



Now we have to change the Hard Round brush's adjustments the way it is indicated in the tables below:



Introduce with the same brush several wavy lines: