During my time at Microsoft, on their Windows Fonts and Icons team, parts of their interface were going through a major revamp. Our team was tasked in coming up with updated Windows app icons, which aligned with the new Fluent Design treatment done with the Microsoft Office icons. 

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Below (and above) are just a few I refined, out of many concepts I created. I used a controlled blue palette to ensure hues would not clash, when their final palettes would be assigned. All concepts were done on a 48x48 pixel grid with guides, to ensure consistency with size ratio, corner roundness, and visual alignment. 

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Icons are scaled up on this page to show detail.