interessting bars might be in
Cata:
Alysrazor: 3 feather as seen in this video:
http://www.youtube.com/watch?v=6bGWaFJzAec
Lord Rhyolith: Arrows to left and right as
seen on this screenshot
Atramedes: The ring
screenshot
Cho'Gall: That pink sword
Here
Nefarian: There was a power bar like this one for Onyxia:
Quest that you get with lvl 85 where you go to Stranglethorn don't know name but you had this way power bar... same was use in Hyjal for firelands dailys
