Do you wish to be branded an official Carnival carny? Kelli Staley has your solution:

Kelli recommends stealing it from her site at http://www.kellistaley.com/images/carnival.jpg

She also recommends linking it to the Blog Carnival page. That's a reasonable choice, but I might recommend the Carnival wiki page as an alternative. Quite frankly, I think I update it in a more timely fashion. But y'all do with your badge whatever makes y'all happy.

Thanks to Kelli for making the badge!