PNG MORE
Desktop apps
3D
Free Applications Icons
red, tick, yes
Black
24x24
PNG ICO ICNS MORE
Computer & hardware
Human o2
Dialog, tux, question
128x128
Dialog, warning
Mixed
Pixel
Dialog, talk, Chat
LightSlateGray
32x32
Kailoon
Dialog
DarkSlateGray
Dialog, Error, cross
Red
UI
Gnome icons
cancel, Error, gtk
Firebrick
warning, gtk, Dialog
SandyBrown
Info, Dialog
LightSteelBlue
Form, Dialog, Letter
Dialog, Form, show
Tango
infomation, worning, Dialog
Tomato
Dialog, Idea, Information
warning, Dialog
Smooth
User Interface Icons
Dialog, Box
WhiteSmoke
80x80
Network & communications
Oxygen
unknown, Dialog, knowledge
Gainsboro
Dialog, cancel
DarkRed
48x48
Close, Dialog
Dialog, Information
Teal
Dialog, Error
Dialog, warning, Alert
Orange
Mini
interface, Dialog
Lavender
16x16