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UI
Pixel
WooFunction Icon set
Database, warning
Gainsboro
32x32
Folder, warning
Wheat
warning, Page, Blank
WhiteSmoke
Page, table, warning
Text, warning, Page
warning, search
DarkGray
user, Man, consultant
DarkSlateGray
user, warning
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Tiny icons
warning
Orange
10x10
Fugue Icons
Eye, view alert, exclamation
DarkGoldenrod
16x16
Computer & hardware
3D
Discovery
Dialog, warning
Black
warning, sign
Music & multimedia
Smooth
Ose
Alert, exclamation, warning
Brown
128x128
Mixed
I like buttons
RoyalBlue
Desktop apps
Free Applications Icons
Hand, Block, stop
Red
24x24
Message, Attention, exclamation
OrangeRed
Alert, exclamation, General
Tomato
Alert, hanger, warning
warning, ban, Block
danger, Message, Attention
Goldenrod
Business & finance
Phuzion
warning, Alert
Soft Icons
warning, Alert, exclamation
SaddleBrown
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Quartz
Email, warning
64x64
Human o2