I've been playing my Pally for a while, and I often forget when I change auras (say, to give me resistance versus casters) to change back to my default (Retribution). As well, I sometimes forget to re-bl;ess myself, or to change my blessing back after swapping it fo whatever reason.
So I'd like to suggest a mod that does the following:
Displays a pair of icons - your current Aura (showing the actual Aura icon, not the in-effect glow), and your current Blessing, as cast by you.
If there is no Aura or Blessing in effect, the icon is changed to something that will notify you to that fact (perhaps the default questionmark icon) and (possibly) the border colour highlights.
Is scalable, can be placed anywhere on screen, and can have the icons oriented vertically (one above the other) or horizontally (side-by-side).
<OPTIONAL> Display the time remaining on the Blessing within the icon.
That's it. Fairly simple. The only issue I can see with this is managing icons while in a group (is there a way to determine the owner of a buff - ie: who cast it).