For the last celebrations we have had a namebadge so that you could easily recognise people from FF/JC when you are running around. I think it would be nice to have one for CE as well. The process lately has been to let people design a badge, if there were several designs then there was an open vote on the forum to get a winner. Then everyone could just personalise and print their badge out on themselves. Here's the thread about the C4 badge to see what I mean.