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Photography & graphic design
3D
32x32 Free Design Icons
yes, mark, Apply
Black
32x32
mark, checking, spell
Signs & symbols
Free 3d Glossy Interface Icon Set
mark, support, question
64x64
yes, mark, validation
Attention, Error, cautious
warning, danger, Alert
Prompt, danger, exclamation
Prompt, help, danger
Accept, ready, tick
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UI
Gnome Web Icons
unread mail, envelope, mail
unread, Gnome, mail
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Desktop apps
Free Applications Icons
red, tick, yes
24x24
Check, Accept, green
Maps & navigation
Vista Style GIS/GPS/MAP
mark, flag1leftblack, pinpoint
256x256