ok.. some ppl have said they would like to create an original guild.. here are some original (i think) ideas:
Messengers/deliveries/postal service - basically providint he service of carrying fetching items.. if the game devlops so that certain places have a dangerous area between them...say a dungeon maybe... this will allow the safe (depending on skill level of members) transport of goods
Private investigators - i think u can guess what they would do
Authors - ok.. so u had a good battle, wanna indulge yer ego.. go to the authors guild, tell em the basic events... they write a nice story about it.. sell u as many copies of the book as u like
photographers - basically provide the service of taking screenies, touching them up + emailing em to u
decorators - when u get a house these guys will come in and do yer deco (on my last server lotsa ppl enjoyed doing this).. for a price
Actors - put on plays... get the AGES guild to act as a box office (excuse my lil plug).. make money
Bankers - provide a currency conversion service, loans, etc... basically anything a bank does
caterers - provide lavish banquests for special occasions (eg weddings... tigereco might even be yer 1st customer if u r quick

)
insurance - u pay em a regular fee to insure an item.. they replace/pay its value if u loose it (might need some consideration to avoid scams)