The "Text" tile is the default tile type and lets you create tiles consisting of:

Text only: You can enter plain text and also include HTML tags as needed. The second tile to the right illustrates the available default font sizes and uses the below setting: Content:<h1>Welcome to our Project Homepage</h1><h2>Welcome to our Project Homepage</h2><h3>Welcome to our Project Homepage</h3>This is regular body text
Text linked to a target page or a document: The first tile to the right�is linked to a SharePoint document library and thus automatically displays the corresponding icon. You can also embed the "[count]" placeholder in the "Content" setting to display the number of items in the tile. This example uses the below settings: Title:HR DocumentsURL:http://somedomain/Shared%20Documents/Forms/AllItems.aspx
Text with a background image: This example uses the below settings: Content:<h1 style="text-align:center">Book your PTO</h1>Background:http://somedomain/Pictures/Island.jpg/cover
Options: This example uses the below settings: Content:<p style="text-align:center"><img src="{photo}" style="border-radius:50%" /><br>Good {timeofday}, {firstname}<br/>Welcome back!</p>Supported placeholders:{username}{date:format}{timeofday}{firstname}{lastname}{photo}[sitelogo][title]{Dilbert}