What I would like as an option to Quartz, eCB or w/e is an option to add an animation for the castbar. Similar to the texture option.
Just a few ideas:
Lightening (this would add lightening and sparks around your castbar as it loads)
Venomous (this would add a poisonlike mist around the bar)
Destroying (this would add a crushing like effect to the front of the castbar as it loads, like forcing its way through a wall)
Holy (benediction-like glow effects sparkling around the bar)
Now, if you think about it, this could look either really cool or really awfull. It's not easy to describe this in a good way, so use your imagination. I know for example, that the Lightening effect would look awsome for a shaman and the Holy for any healer.
I dont know if this is technically possible, but if it is, I demand that the coders atleast think about it. I'm sure there's better ideas for effects than mine.