If you are developer and not a graphic artist it is always a challange to find/create icons. Windows 10 has a symbol enumeration that you can use that contains the most common icons/symbols (you find the complete list of symbols here: https://msdn.microsoft.com/en-us/library/windows/apps/windows.ui.xaml.controls.symbol.aspx).
The not only look good they are easy to use to, just use the SymbolIcon element. The code below shows a settings icon.
<SymbolIcon Symbol="Setting" />
If you want to change color on the icon just use the Foreground attribute.
<SymbolIcon Foreground="Gold" Symbol="Favorite" />
The symbols is based on the "Segoe MDL2 Assets" font (You can read more about it here: https://msdn.microsoft.com/en-us/library/windows/apps/jj841126.aspx).
If you want to read more about Windows 10 development I have created a list with all my Windows 10 blog posts, http://danielhindrikes.se/windows-10/, more will be added.