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UI
Glyph
Round UI Buttons
Gear, system, settings
OliveDrab
512x512
Options, preferences, Setting
Tomato
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Basic interface
Options, tool, profile
Black
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GlyphPack
settings
432x512
Google Material Design icons
settings, Applications
Windows 8 metro style
DarkSlateGray
256x256
Free Mobile Icon Kit
settings, phone
64x64
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Windows 8 icons
26x26
iPhone Toolbar icons
settings, preferences, system
Gray
Ecqlipse 2
settings, Folder
128x128
settings, powercfg