Showing their creativity on these awesome looking items proved to be enough to gain Valve's respect. Here are the three standout sets that have beaten very close competition to clench victory.
Crystal Maiden's SnowDrop Set
Naga's Exile Set
Beastmaster's Red Talon Set
Images from polycount.com
It is important to note, that Valve chose not more than one set for a hero. However, that does not mean that those who didn't win, will not make it into the client. Winning sets will be available coming next week, the rest is announced for January.
If you want to know what criteria were important, what common mistakes in most submissions where and why the following sets were chosen, read Valve's full blog.