I played around with WeakAuras (3rd part addon) to see what you could do with it. I found a nice glowing effect and decided to make a Holy Power tracker for those that don't want to use Blizz's one (or another addon).
Some screenshots to show it in action:
Active if having Holy Power
Hides upon 0 Holy Power outside of combat (Text is not part of the WA)
Always active in combat
The spheres (which are also animated) are in a group so you can move them all together.
Tip: Triple-click to select all, unless you want to mark and scroll, your choice
Code:
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P.S. To import into WeakAura, copy the code and go in-game. Open up WeakAura (/wa), press "New" (top left) -> "Import" (bottom right). Paste the code, and if you don't have any errors you should be able to press the red "Import"-button in the small preview window that pops up (named "Holy Power").
Edit: Updated alignment to pixelperfect (as close as it gets, sorry for your OCD)