A follow up to Lesson 5.
I decided to try something different with my pointed border.
I wondered what would happen if I started with a Vector instead of a Raster.
So I created a triangle with the pen tool. Then I created a script to rotate so that I had 8 triangles. Then I merged visible to a new layer, duplicated, rotated, then merged visible to a new layer and rotated again. This came out exactly as I wanted it.
I may change the script to make it more flexible but for now, using a vector, I have what I wanted.
And I have somewhat of what I want a glow by duplicating a layer, changing the colour and using Gausian Blur (multiple times).