Hey there. Shameless plug of The Gnomish Air Corps. [A-RP] The Gnomish Air Corps - Gnomish Fun!
We are new and just really forming up with a few members so far but hoping to build a strong and stable government… I mean… guild. Also you get free character graphics if you sign up 
(Ignore the WoW Forums that refuse to update my guild tag 
)
Also I agree that the Arclight Association are a cracking bunch of Gnomers and Gnomette so I’d also check them out to see if they tickle your fancy. Certainly bigger and more established than the G.A.C.