I like the little bomb on the Bilgewater Cartel Tabard.
It fits in well with the goblins
When you wear the Bilgewater Cartel Tabard all reputation you gain while in dungeons will be applied to your standing with them.
The tabard can be bought from Frizzo Villamar who is the Bilgewater Cartel Quartermaster for 10 silver.
This item will be converted to Gilneas Tabard if you transfer to Alliance.