Howtogeek posted a tutorial about creating custom Windows 8 tile icons

Windows 8 shows desktop application shortcuts on its Start screen, but these shortcuts look out of place in the new, tile-based interface. However, there is a way to spruce up your Start screen with detailed tile icons for your desktop applications.

This trick also works with other types of shortcuts you can pin to your Start screen — folder shortcuts, favorite websites, and direct links to Steam games.

  How to Create Custom Windows 8 Tile Icons for Any Desktop Program