I just hit up the mighty Google and it was interesting, but not helpful.
Search terms 'ICO proper registration SEC' yields some interesting results, including some stuff that I'm not sure made HN, but doesn't reveal any companies that have done so or tried to do so.
I'm not suggesting this, but I bet the first one that properly registers with the SEC (even if it fails horribly and was bordering in scammy) would make a mint. The tag line of 'Officially sanctioned by the SEC' would go a long ways, even if it was doomed (intentional or otherwise) from the start.
Again, that's not a suggestion to make something meet the bare minimal requirements, register, and then make a killing.