PNG ICO ICNS MORE
Desktop apps
Smooth
Farm-fresh
Accept, Check, law
Black
32x32
Pixel
Sizicons
Accept, Blue
Gray
16x16
Accept
DarkSlateGray
green, Accept
MediumSeaGreen
yes, Check, ok
YellowGreen
PNG MORE
3D
Free Applications Icons
ok, success, Accept
24x24
Check, good, tick
LimeGreen
red, tick, yes
Check, Accept, green
KDE Crystal Diamond
approve, check mark, Accept
OliveDrab
128x128