I did a quick search but there doesn't seem to be one of these threads [maybe for a reason? ]. Either way I like to see what other people's UIs look like...it's what has helped me tweak mine to where it is today. These are pics are of my main and not my multiboxing characters. They are full 1920 x 1080, sorry if that's kinda huge.

Pic 1 [ Out of Battle / In Battle ]
Pic 2 [ Out of Battle / In Battle ]
Pic 3 [ Out of Battle / In Battle ]

Pic 1 - Back when I first returned to WoW a few months ago [for the 3rd time ]
Pic 2 - After I transferred to Tichondrius I went for a more simplistic setup. Not a real good 'In Battle' pic.
Pic 3 - Something I compiled yesterday...and I'm liking it. Still tweaking here and there though. Haven't raided with this setup yet.

Pay no attention to where my abilities are in the new pic....they're all over the place and I'm keybound for PvE at the moment and I click a lot of stuff for PvP . Going from a 4 bar high setup to a 3 bar high setup and I had to consolidate.

If you have any questions on what mods I'm using feel free to ask.