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UI
Pixel
Blueberry
Check
YellowGreen
32x32
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Windows 8 Pack (Metro Style)
Check, Book
DarkSlateGray
26x26
Mixed
Frankfurt
DarkOrange
Avatars & smileys
Hamburg
check mark, Check
DarkKhaki
Computer & hardware
WooCons #1
Check, button
Check, Active, button
DeepSkyBlue
Sketchdock Ecommerce Icons
green, tick, Check
24x24
Cologne
LightSkyBlue
Munich
Fugue Icons
Check, ok, Accept
RoyalBlue
16x16
Boxes, ui, series
Gray
Check, ui, Boxes
Johaupt Free Icons 01
doctor, Check
BurlyWood
Gainsboro
18x18
Silver
ForestGreen
PC 100 Icon Pack
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Super Simple Grey Series
Black
64x64
mail, Check
DarkGray
Bitcons
Goldenrod
Arrows
Sanscons
Check, Error, spell
DarkRed