You know, I'd be lying if I said I'd never considered something like that. =P Using the actual ring, however, seems rather clashing with the level of detail already in the logo. In a logo where the highest level of detail is a gradient, putting the ring in there would stick out too much. I was thinking more like. . . the Sonic 2 HD ring animation, but with no shading or detail; just the solid-colored O emulating a ring. 'Would certainly be a neat little illusion, anyway. Of course, that doesn't need to be in the logo; that's up to the engine designers, but the idea's there in case anybody would like to do that. And if there ever were to be multiple openings for the logo, a la SEGA Genesis, people can always use the actual ring for the O if they want to.