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Photography & graphic design
3D
32x32 Free Design Icons
mark, checking, spell
Black
32x32
Signs & symbols
Free 3d Glossy Interface Icon Set
yes, mark, validation
64x64
checkmark, Accept, Check
LimeGreen
80x80
yes, ok, Check
Lavender
Accept, ready, tick
Avatars & smileys
X-mac
validation, input
400x400
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Desktop apps
Free Applications Icons
ok, success, Accept
24x24
Check, good, tick
Check, Accept, green