This not really a tool but I guess it can be modify to one. The news is there are lots of badges left from Defcon 20 and as such they will be selling them online. I know not the same as being at defcon but still maybe worth a purchase.
"We hope to have #defcon 20 badges for sale next week. http://Hackerstickers.com is building the pages now. "
From The dark tangents twitter feed!
I'm an InterN0T'er