^The SAdv3 and Battle sprites that are mostly just heads would actually look pretty good as decals, since the cut-off almost looks intentional. I don't think the same could be said for the S3&K sprites that are missing, say, half a boot or a head. Makes me wish I'd had VBA, so I could've had access to decals like that ages ago.
I suppose we'll end up applying a small logo to our emblems to stand out as TSC members, or voting on one for a standard. If the latter, may I just say that the first Shadow, Knux, and Chaos pics on your site get my votes, as well as my heads for simplicity's sake.
EDIT: Brief thought: perhaps, with the more simplistic emblems, multiple users could use different colors? I know those with alike MK:DS and TSC names would be able to tell each other apart, but I figured putting a small pic of your colored emblem in your sig/avatar here would make it really easy to tell who you are on MK:DS. And re-coloring only takes a minute or two, so it wouldn't be a real hassle.