Generally I like blue to have a grey undertone, I like it as it gets close to purple and as it approaches teal.
I have a big problem with turquoise. Such as this.
But not if it is glass.
That is completely different. And if it is combined with other colours I can go for that too.
And I would never accuse Mother Nature of creating something ugly.
But most of the time, I hate turqoise.
Photos: homelife.com, Flickr