Perl 6 is more than just the test suite. It's a language specification, a reference parser, a test suite, and perhaps a reference setting implementation. All of the things about the language that are not tied to a particular implementation are part of "Perl 6".
Rakudo is a particular implementation of Perl 6 using Parrot. While it is a separate project from both Perl 6 and Parrot, it is intimately tied to both, and I think its logo should reflect that. I don't see much point in having separate logos for "Rakudo on Parrot" and "Rakudo without Parrot". I mean, I suppose much of the frontend work could be ported to a different backend, but would that still be considered Rakudo? (Incidentally, the "Rakudo" name arose while I wasn't really paying attention to Parrot developments, and I missed its advent. So let me a-year-belatedly say that I find it a very nice coinage. Besides getting the camel and the idea of The Perl Way in there, and of course the "perl = paradise" implication is a nice touch, I like that if you squint at it sideways you can almost see the word "roku", which is Japanese for "six".)
