As Death Knights started in Wrath they missed out on having the old tier sets to obtain, but that isn't the end of the world. There are many off set pieces and look alikes to keep and old DK happy.
WoWWiki look alike site will help you find sets that will make your DK look a bit more brighter, with less skulls.
The Worgan DK look in the first picture is made up of the following:
Myrmidon's Treads
Grips of Silent Justice
Leggings of Divine Retribution
Helm of the Illidari Shatterer
Belt of Seething Fury
Chivalric Chest
Frostblight Pauldrons
Shroud of Forgiveness
Slayer of the Lifeless
