Not an ElvUI issue, but there are lots of players who will see this.
I haven't had time to package this up nice and neat, but this is an addon that will allow minimal guild communication:
http://www.mediafire.com/file/c28oh2oo3 ... C.zip/file
Manually install by unzipping into your AddOns folder and restart your game.
Usage is /egc Whatever message you want to send.
It'll send to every online guild member except the sender (but the sender will get a notification via the print() command).
Sorry if this isn't the right place - "Offtopic" seemed pretty safe, but you never know.
Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn.