Recently I've been snooping around at item set designs. I've been experimenting with different items here and there to see if they look good together. I happened to run across some items that at the time, looked like they weren't part of a set. I am happy to say that I've found the matching items for some of the sets.
Set 1
This item set's design is outstanding for a male troll. It is one of those sets that looks good on any race/gender combination, but I've found it to look better on males. It pretty much screams that you are a rugged adventurer. The shoulders even have a blue smoke effect!
Set 2
Not my favorite set, mostly because it doesn't match well with some race/gender combinations. I did, however, find that it looks great with worgen male and female, since the normally ugly helmet [that you can turn off] molds with their characters face. All I can say is, it looks fierce on any worgen.
Set 3
Anyone with long ears is asked to step away from this set [while the helmet is visible]. It looks like you have two pairs of ears.
Set 4
Male dwarves look very barbaric with this set on. Some race/gender combinations look better than others, but it generally looks good on everybody.
Set 5
This set looks okay on most race/gender combinations, but I can say this looks much better on a tauren (any race) hands down. The helmet [which you can turn off] traps all your facial features in it.
Set 6
This set looks pretty darn good on a male blood elf. The shoulders have a demonic fel orb that glows green. If you're looking for a weapon to go with this set, get the Golden Bow of Quel'Thalas.
Update: While looking for new sets, I've found out that "Set 1" is a mixture of two sets. Please stay tuned while I find the correct pieces to the set.