Blender 2.8 will ship with monochromatic icons

Blender 2.8 is being shipped with vectorized monochromatic icons, which means it won’t pixelated in the zoomed view, it is a benefit for high-resolution displays.

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You can get your copy of Blender 2.8 for here. It is currently in Alpha 2 stage and not recommended to be used in production environment, use it in development and testing environment.