PNG ICO ICNS MORE
Desktop apps
Flat
Metro UI Dock
mail
Crimson
512x512
Angry, birds
security, denied
Google+
yahoo!
Bin, recycle, Full
Social media
Somacro social media icons
Lastfm
500x500
youtube
Google +1 icons
plus, +1, Google+
256x256
PNG ICO MORE
Social sticker set
youtube, sticker
64x64
RSSesque
feed, subscribe, Rss
32x32