An API template that retrieves a guild's icon. You may search the Ryzom Armory for the guild. Right click on the guild's icon there, select "properties" and retrieve the icon id from the url.
Also you will find a documentaiton of the API here: http://dev.ryzom.com/projects/ryzom-api/wiki/GuildIcon
{{APIguildIcon
|icon=
|size=
}}
{{APIguildIcon
|icon=4505559206513107
|size=b
}}
will output this