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Wireframe Toolbar Icons
off, on off
WhiteSmoke
48x48
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iPhone Toolbar icons
off, bulb
30x30
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Gnome 2.18 Icon Theme
list, off, stock
24x24
Gaming & gambling
Photorealistic
48x48 Free Object Icons
power, electricity, switch
Computer & hardware
Smooth
Crystal Project
Adaptation, stock, off
16x16
stock, off, list
UI
Pixel
Gnome icons
off, Enum, list