From the WFC thread, in case any missed it:
I'm afraid it's not very good, but the best I can suggest as a chrons badge is the attachment below - simply print that out and write your chrons name, or else save and upload to a graphics program, and type your name:
http://www.sffchronicles.co.uk/forum/attachment.php?attachmentid=20130&stc=1&d=1383141073
I've tried to make it small enough to slip into the convention badge, but the logo doesn't resize very well. I've also added "SFF" in front of "Chronicles" so anyone who asks can know what it's for.
Even if no one else wears one, I will, so look out for that. You may notice me better for my bleached blonde hair and rock boots, though.