OK, I can't go.
:-(
But if I was going, I'd want something I could carry around or wear that had my EN World avatar on it.
'Cause my badge would have my real name on it, and my table tents would say my PCs name, and the odds that in talking to a random stranger I'd bring up "oh, by the way, I'm also Sialia" would be slim. Well, unless the subject of ENWorld came up, which is somewhat more probable.
And I don't know many other folks here by their real names--could game with somebody all day and probably not realize that I already knew her from the Boards. But if she had a familar logo on her dice bag or hat, or whatever, I might venture to ask about it.
Just a thought about something you might advertise here before the con. At the con, it'll be too late to order a custom embroidery, won't it?