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Free icons for Windows8/Metro
approval
DarkSlateGray
512x512
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256x256
RRZE
Gainsboro
720x720
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Mixed
Flat
Orbicons (Free)
Agree, approval, approve
LightSeaGreen
Network & communications
Glyph
Communication & Technology
ok, speech bubble, Bubble
Black
UI
Windows 8 metro style
Pixel
Fugue Icons
Active, Status, online
Green
16x16