Default UI Auras?

Back a long time ago, I used an addon called PowerAuras; it allowed me to set up icons and graphics around the screen to notify me of things, like Hammer of Wrath being usable. At some point I had to transition to a fork of it, I think and then to WeakAuras. And then Midnight, obviously. So I haven’t replaced it.
But I still get occasional aura icons on my UI, and I’m not entirely sure where they’re from. I presume it’s the Blizzard UI somehow; I posted a picture on imgur / a / AluShlO, it’s the little gold arc over the speaking corpse.

That one tells me the free holy power ability proc is up. But I can’t figure out how to customize – like change it to a darker color to make it easier to notice. And the free Divine Storm proc doesn’t seem to have one, and that one is one I miss a lot and would love some sort of indicator. Is there a way to add that to the auras/list of things that has a graphical reminder?

You could add either aura to the Tracked Buffs or Tracked Bars features of the Cooldown Manager.

Also, if you have Divine Storm in the CDM, it will probably show some kind of highlight when an associated buff triggers.

I don’t think there’s any way to customize the Divine Purpose overlay in your screenshot. WeakAuras used to be able to display a different graphic on top of the default Blizzard one, but (with a small number of exceptions for HoTs, shields, etc) addons can’t detect the presence of specific auras (in combat) anymore.