If you fancy creating your own tiles for the Windows 8 Start Screen try OblyTile..........great little program.
Here's a link to a 'how to' and the article gives a link to the software download.........http://www.tekrevue.com/tip/how-to-create-custom-start-screen-tiles-in-windows-8/
I was looking to make a tile for iTunes and came across it.........and it's simple and works great.
You're welcome 
