Here are some that I think work out okay:
Tabard of the Defender
http://i39.tinypic.com/rbehc9.jpg
Green Trophy Tabard of the Illidari
http://i43.tinypic.com/3089jxh.jpg
Purple Trophy Tabard of the Illidari
http://i43.tinypic.com/2nrgemq.jpg
Cenarion Expedition Tabard
http://i41.tinypic.com/sfhrp5.jpg
Skyguard Tabard
http://i40.tinypic.com/166wso3.jpg
Ogri'la Tabard
http://i39.tinypic.com/vhrfc1.jpg
...or make your own guild tabard, like such: