DC has been handing out plastic Flash rings at conventions this year. Sadly, I managed to miss the relevant panel at San Diego (IIRC it was the Geoff Johns panel, and it conflicted with Robert J. Sawyer), and I never managed to hit the DC booth at the times they were giving them out either.
As you can see, it’s just plain yellow plastic, but it’s sculpted. Try as I might, though, no matter how many times I hit that button on the side, it didn’t open up to release a costume.
Actually, I do have a Flash ring with a miniature costume somewhere in storage. DC Direct released a replica Flash ring with a stand. It’s held open slightly so that you can see the costume inside. Rather than hunting through storage, I searched online and ganked the first photo I found, from Planet Krypton.