Hey lot, more from the Power Aura's preacher here! I found this addon yesterday: Weak Aura's. Basically it's Power Aura's but with more and easier functionality! It was originally intended to be a more basic version of PA but since PA stopped development, WA included all of PA's features in it.
http://www.curse.com/addons/wow/weakauras
Get it, use it, love it!
It's also got a function to link aura's as chat links, so other users can click them and import them. I've of course already made the ones most of us use for Domo - Seed Timer and Energy warning (65%). They look exactly the same :-)
Overall I love it, the animation for aura's are a lot smoother. It also has simpler features to make for example a timer, and it's easier to select a texture. They even added the built-in Blizzard aura textures!
Here are some awesome examples:
http://www.wowace.com/addons/weakauras/pages/examples/
http://www.wowace.com/addons/weakauras/pages/list-of-available-custom-triggers/
Is it possible to load premade PowerAuras into the WeakAura addon?
Was wondering that myself, but I don't think you can. Let me know what you need though, as I'm thinking of making a database of aura's people can import. Be happy to build one :-)