Apophysis star fields
"Apo starfields" are star fields generated in Apophysis. They are basically almost the same as Photoshop-generated starfields (PS starfield), but they are Apophysis generated. In my opinion, they are more pretty then your usual PS starfield. Other then that, they are the same as PS Starfields.
What's the use?
Besides making it for fun, you can use the starfield as a background to your celestial-looking fractal. Maybe as a background of a fractal that looks like a planet. I have an example, made in April, last year: http://hyruwen.deviantart.com/art/The-Blue-Planet-53838723
What's the benefit?
You can claim (brag, in other words) that your new fractal is 100% Apophysis made because you did not use a PS starfield. You used Apophysis instead to make a starfield.
(Of course, when it comes to merging the foreground fractal and the background starfield, you need an image-editing program like Photoshop, but you didn't use anything that was