So here are a few of more Thieves Guilds archetypes. Clearly, I have a problem. This is my cow bell to be sure. I think the Thieves Guild is an interesting element and can be used to serve a lot of functions. Sometimes they are just vehicle for the thief in a party to get things. Sometimes they are plot hook providers. You can use them as the premise for a group of PC’s or you can use them as antagonists in your campaign.
With all of that in mind, here are an extra set of guild ideas. They could easily fit in a number of campaigns. I also have my previous post listing some World Guilds. Between these I hope I have given enough fodder to help spice up your underworld.