This is just a little idea I've been playing around with using WeakAuras in order to keep my UI extremely minimal and clean.
The main idea is to track certain things using "Dots" (not damage over time!).
Left "dot" represents the availability of Shield Slam, replaced by cooldown text when used. The right "dot" does the same, but for revenge.
The central "dot" represents my Rage level. It changes colour dynamically; Red when capped or below 20, orange when at 20-59, green at 60+. Cooldown text for Shield Block appears inside this circle. The text below it represents the rage value.
The text beneath the Shield Slam "dot" shows my own HP, while the text below the Revenge "dot" shows my targets HP, changing colour to red when at 20% or lower.
I've also created slightly larger "dots" to the left and right of this group to represent tank raid debuffs for SoO bosses for myself and my focus target, displaying stacks and duration, seen here: http://i.imgur.com/LC9xnHi.jpg
Check it out in action:
http://youtu.be/yA-3PNCsXI4
I'm still tweaking and testing things, but what do you guys think?