
Originally Posted by
ravells
Create a new layer, call it 'Crennalations'
Press F5 to bring out your brush menu and choose a hard square brush. In the brush tip shape menu drag out the spacing to over 100% so you have a gap between the squares. In the shape dynamics section, set Angle Jitter to 'Direction'.
Now make another circular selection (using the steps used above) so that it lies half way between your walkway and the outer edge of the base.
Select the 'Paths' menu (it should be to the right of your layers tab, if you cant see it, then click Window/paths)
At the bottom of the paths menu there should be just one active button (it looks like a circle with a path arcing over it) and click it to make a work path.
Two buttons to the left of that is another button which looks like an empty circle (stroke path) and click that. Your work path will now be stroked with the brush selection you made earlier.
You may have to undo and set the brush size and spacing of the crennelations brush to something you prefer. When you're happy delete the work path.
If your crennalations come over your walkway, then just drag the crennaltion layer below the walkway layer.