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I would treat this like a desert wine. You're not going to drink the whole bottle, but a small glass at the end of dinner is nice. You could do the same on an e-commerce site - work through the checkout process normally, and then make "Confirm purchase" button more fun to click.

Might be better to just animate them on click. Hover animations/color changes had some use for links, but a button shape already conveys "clickability". On the other hand, animating on click gives a nice feedback (how many times have I clicked a slow-responding link and wondered if I really did).

Good for distracting a user on a slow ajax day

I can see using these, but only sparingly. I don't think I'd use that preview eyeball. It's kind of creepy... :)

yeah, i kinda thought that same thing. these would be good to use for certain projects and in certain situations, but i don't think i would replace static icons with animated, ever.