Note - I DIDNT make this UI. I posted this because i like this and it looks kewl.
Author: GrimUI : WoWInterface Downloads : Class Specific Compilations
This UI is designed for 1920 x 1200 (widescreen)
NOTE - Your monitor has to be wide screen. Havent tested it with normal size screens
How does it work? - First you must download this file. Then back up your current Interface and WTF folders in your World of Warcraft directory. Delete your current WTF and Interface folders. Replace them with the ones you just downloaded. Next you will need to rename the folders in the WTF folder. The folders are currently named with the description of what it should be renamed with. The folder AccountName should be renamed with your account name. The folders named with class titles should be renamed with your characters name. IE: Warlock should be renamed to BillyJoeBob, if BillyJoeBob is the name of your character. I recommend removing the folders for the class's you do not have characters to match. The warlock and DeathKnight class's are most complete and tested, if you have problems with the WTF for your particular class I would use the Warlock folder instead.
Here is some pictures: