It's been a while, but here is my latest creation! First pic is an in-combat pic of what I have been running with, and the second is just me trying out a transparent backdrop, as opposed to an opaque one. I usually tend to stay from Health Bar transparency while tanking, but I think I have a good balance of opacity goin' here
As usual, I apologize for the low screenshot quality... once I get enough money, I am gonna build a monster computer
EDIT: Added a third pic showing the transparent version in-combat (ish). The test-mode threatmeters have a different backdrop, but oh well. You get the idea