Along with the release of Web Tiles, Microsoft also released a Web Tiles Authoring website. This website walks you through creating a new tile step by step. Let’s take a look at how this works
Step 1: Choose a layout
Here you pick which of the six layouts you’d like to use for the tile. You can choose from displaying a single page tile or multiple page tile. Multiple page tiles must link to an RSS or ATOM feed. This is not a requirement of web tiles; it is only a requirement for the authoring tool. Web tiles can have multiple pages without needing an ATOM or RSS feed.
Here you enter the url that will contain the data for your tile. If you picked a multiple page layout from Step 1, you must enter a URL for RSS or an ATOM feed. Again, this is not a requirement for web tiles, only for the authoring tool.
Here you select what information from your json feed you would like to display. You simply drag the data from the right and drop it onto the place you’d like to display it.
Step 4: Make it yours
Here you’ll set the information to make the tile yours.
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http://visuallylocated.com/post/2015/07/09/Easily-create-Microsoft-Band-Web-Tiles-with-the-Web-Tiles-Authoring-website.aspx