siggy's are pictures w/ your real name or screen name and sometimes even a groups' name that your in! and you use them by going to your personal preferences and clicking on signatures follow the directions from there! :)
you might be thinking of the seetpeas and emoticon thingies.
siggy's are at the end of your posts usually with your name, or a link to a group or site, or just a comment or something along those lines :)