I hadn't really thought about it before, but while reading what's above, I realised I have a wide range of odd noises for various situations.
There's hello-meow, question-meow, I'm-super-happy-meow and are-you-ok?-meow. 'I've run out of things to say' is purr. Horse means I'm distracted, seagull means I'm patiently waiting, frog means I'm impatiently waiting, quiet high-pitched eeeeee means I'm trying to concentrate and not succeeding, deep-growl means I can't find something I'm looking for.
Only the meows are specifically animal imitations, the rest just seemed like the right way to express myself.
I'm now not sure if anyone else understands these - I've never knew I did it to this extent or told anyone what they mean.
An aside - I can greatly annoy my cat by exactly copying her - the meows get progressively bitchier, then she snaps at me and trots off 
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The rule for today.
Touch my tail, I shred your hand.
New rule tomorrow.