This is a custom UI I did for my guildie MadeInChina.
Shadowed Unit Frames
Elkano's Buff Bars
Drag the WTF and Interface files into your WoW folder, MAKE SURE YOU HAVE BACKED UP YOUR EXISTING FOLDERS. Then go into the WTF folder and into the account folder inside of it. From there change the name of "Insert Account Name" to the name of your account, and inside of that change the name of "Insert Realm Name" to the name of the realm your characters are on, if on multiple realms copy the folder and rename it to the names of the different realms, then change the name of "Insert Character Name" to your character's name, once again copy and rename as needed for multiple characters.