It's an idea which has come up before, but has never proceeded.
I think Stuey and the mods have some reservations about it, or it might just be that they don't have the time to organise it. I remember that at one time we were going to organise t-shirts, but unfortunately the member who was going to get them printed left the forum and the idea perished!
It would be good to hear what the mods etc think about this idea. Perhaps , if they are willing in theory, we could do a poll to see how many of us would want one and how much we'd be willing to pay. I would love some kind of badge and/or a car sticker!