I was thinking that a logo doesn't really need to incorporate a symbol (e.g. camel, onion etc.), and that one of the more important aspects of a logo is the typography.
Rather than ramble on with ideas, I decided to make something to look at: http://www.rakudo.org/some-rakudo-logo-ideas Also, I really think the services of a professional designer are needed. Is there any possibility of some funds being allocated to hire one? (Who did the Parrot logo?)