To gain more insight into a vowel sound's harmonic overtones, I sorted a list of onomatopoeic vocabulary words by their vowel color. Click here to see it.
This list was compiled by Kathy Steineman who has it sorted alphabetically at 300+ Onomatopoeic Sound Words: A Cheat Sheet for Writers.
So what do you think? Can you hear the related harmonics when you read the words on the list? Does a particular vowel carry with it a specific real-world musical association or emotion for you?