PNG ICO ICNS MORE
Desktop apps
Glyph
16x16 Free Toolbar Icons
ok, tick, Blue
DodgerBlue
16x16
Smooth
Farm-fresh
yes, Check, ok
YellowGreen
32x32
PNG MORE
3D
Free Applications Icons
ok, success, Accept
Black
24x24
Check, good, tick
LimeGreen
red, tick, yes
Check, Accept, green
3D Cartoons III
ok, Check, selected
128x128
One bit
yes, done, true
DarkOliveGreen
48x48
Pixel
Splashyfish
save, yes, green
ForestGreen
33x33
Circular
ok, yes, green