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Desktop apps
Flat
Circle Icons
Picasa
OliveDrab
512x512
Circular icon set
WhiteSmoke
256x256
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Social media
Funky - free
Gainsboro
UI
Metro UI Icon Set
Picasa, google
DarkOrchid
google, Picasa
LightSlateGray
Metro UI Dock
Mixed
Google icons
Black
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Mirror, google, Picasa
640x640
Picasa, Mirror, google
Retro icons
AntiqueWhite
60x60
Somacro social media icons
500x500