Way back when I was learning how to Frost DK, I had a really difficult time getting used to the default game auras. You had one giant icy blue glowy thing, and...some other giant icy blue glowy things.
And what made it even worse was that the proc names didn't have anything to do with the abilities they were supposed to indicate. Killing Machine gave the buff Killing Machine, which meant to Obliterate, while Rime gave the buff Freezing Fog, which meant to Howling Blast.
Considering I'd never played Frost at all before, these were way too many new names to remember all at once. So I designed some power auras that screamed at me in giant letters which ability I was supposed to use. A little training-wheels, but it worked for me, and that's what counts, right?
However, some time into Cataclysm my auras starting completely freaking the hell out. (click for larger version)
I don't know what happened (I assume some patch incompatibility) but my beloved text auras started growing in size every time they activated. So at first, the text would be fine. The next time, slightly bigger. The next, even bigger, and so on, until they were literally covering my entire screen.
I tried changing the fonts, but that didn't work either.
In the end, I had to scrap the text auras and resort to some more conventional choices - a big "SLOW" to indicate it was time to Howling Blast (because in my mind, Howling Blast = Chilblains, thus "slow"), and a simple timer on the other auras for my Obliterate alert.
Of course, the ironic part is that since Power Auras was incredibly late in updating after patch 5.0.4, I've since switched to Weak Auras. There's some things I like, some things I don't (less auras available to choose from, and inferior large-text options in WA are both BIG negatives, in my book), but I doubt I'll go back to PA now. Even if they DID fix the text aura glitch.