PNG ICO ICNS MORE
UI
Pixel
Fugue Icons
megaphone, Arrow
SteelBlue
16x16
exclamation, megaphone
Red
megaphone, pencil
megaphone, Minus
megaphone, plus
Green
advertising, megaphone, promote
DarkSlateGray
24x24
Computer & hardware
Smooth
Crystal Project
blog, promote, notifications
256x256
Network & communications
Oxygen
blog, megaphone, Promotion
128x128