As we're still discussing the final choices for our own guild, i realized it's nice to know the options you have. I have to say the options to choose from are far less then i expected, a tad disappointing. I also think it's too many different border options, which will enable two guilds to have nearly the same heraldry on the same server, as the borders are not very distinct - assuming the "unique" combination reserved for your guild is the combination of background color, border, emblem and standard shape.
Anyway, i found two websites listing the different choices:
Destruction Guild Heraldry
Order Guild Heraldry