Tweak [gif]

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(hit the 2x)
This is a "Tweak" icon designed to function as an app icon, a "loading" graphic, and as a very small animated UI component. That's why the proportions of the details are over-the-top, it needs to be recognizable down to a very low resolution. I'm attaching 4 additional animated sizes that will be used in different situations (when the smaller ones are actually implemented they'll have no background or drop-shadow, so even that 50x50 pixels one should be usable). Also attached is a 1600x1200 version for fun.