I created a cooldown progress bar and 3 feather icons for this in weak auras. Power auras 5.0 RC3 can do the same thing, but I had performance issues with it in large raids and the author hasn't released his updated version in time for MoP release, so I switched to weakauras.
Stupid forum won't let me post the screenshot directly since I'm "new":
You can import the following into weakauras if you'd like to try my setup:
Timer bar:
Code:
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Feather 1:
Code:
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Feather 2:
Code:
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Feather 3:
Code:
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Note that I also made these custom triggers pass the info for # of charges to the aura as the stack count, so if you want text that shows the charges available on your aura, just add %s to your text string. The time until the next charge generates is also passed as duration, and all the other text stuff should work too (%p, %t, %n, etc).