In-case you'd like to piss off your guild before you /gquit, you could always use this one..
If the guild has a Guild Bank set-up with several bought tabs, go to a General Trade Vendor and buy a whole bunch of the lowest-level throwing weapon (should cost 13c) and an equal number of wrapping papers. Wrap all of the throwing weapons with the paper, and then deposit them all in the guild bank, they all take-up one slot, so it should be fun since the guild leader has to do it otherwise it uses-up the officers' withdrawals for the day.