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UI
3D
Gnome Web Icons
Dialog, 48, tick
DarkOliveGreen
48x48
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yes, ok, tick
Black
64x64
Mixed
Smooth
Humility
Apply, Check, ok
Snowish
gtk, Apply
128x128
Desktop apps
Illumine
Things, Apply
LightGray
Ultimate Gnome
ok, yes, Check
256x256
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Free Applications Icons
ok, success, Accept
24x24
red, tick, yes
Check, Accept, green
Pixel
Gnome icons
Filters, Apply, mail
Computer & hardware
Crystal Project
Clean, yes, correct
Glaze
Blue, Apply, Check
CornflowerBlue