I think an all-gobbo list could work very well, even without Night Goblins. Just think about your unit choices. I take it by "only Goblins" you mean "not Orcs"; i.e. are you thinking of pure Goblins or Goblins with Trolls, Snotlings, and Giants?
Basically, you want a horde of the little fellas, supported by something fairly hard-hitting like a giant or trolls, and war machines. To be honest, I think all-Goblin armies are more flexible in terms of army composition than all-Orc armies. Not sure about how you would work it, but I suspect you'd be forced to go with a horde army.
GS
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