PNG ICO ICNS MORE
UI
Pixel
Gnome icons
Check, macro, Brackets
Black
24x24
Check, filled
16x16
Fugue Icons
tick, frame, Check
DarkSlateGray
ok, shield, Check
Green
Accept, Circle, tick
Check, ok, tick
tick, Check
Mini
Page, Check, ok
LightBlue
Silk
Active, validate, right
MediumSeaGreen