Sunwarmed Furline

Source: Blizzard cash shop mount

Notes:

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• Flying: Yes. It doesn't sprout wings or anything; just runs across the sky as befits a magical creature.
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• Summoning animation: Your character throws a fish on the ground. (A bit disappointingly, you don't actually see the cat pouncing on it. Perhaps they couldn't fit it into the mount cast time.)
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• Mount Special: (hitting spacebar in nonflying areas or typing /mountspecial) causes the cat to look around avidly, then chase its tail for a couple of seconds.
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• Mount Idle Animation: the cat licks its paw and uses it to wash its face.
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• Sound: No noise from movement. The cat mews just when you start flying or change altitude. Also gives a really heartrending meow if mobs hit you while you're mounted (makes me feel bad)
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• Effects: The white parts of the cat's coloring (tail tip, paws, ears, chest, face, whiskers) actually do glow. It's especially noticeable in dimmer areas, such as when you visit the Darkmoon Faire. Additionally, faint sparkling dust continuously falls from the tail tip.
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You can activate

• [item=140309]
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  and then fly like a nyan cat for limited time ^v^

I like how the character drop fish on the ground to Summons Sunwarmed Furline.