I agree that it would be good to have a way to distinguish Indiegogo backers. I put my backer group (Early Bird) and marked it with the star. And turned it gold. Having an organized way to denote backers and members would be helpful.
When I looked at changing the icon I noticed that one can upload a custom icon. Would it be possible for one of the artistic members of the community to create a custom icon that backers can download and set as their custom icon? Perhaps the V upside down pyramid logo (bloody V, white V?)
Edit: OK, so I just uploaded the first image @Konstantinos had uploaded in the Community Art thread. It becomes a rectangular icon with the red spray-paint (bloody) triangle V logo. Check it out in Tennessee, USA if you want to see it. What if we used something like that as a way to say "I'm a backer"?