substratum_tab_featured_themes.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<substratum>
    <theme id="BigBlu">
        <author>cerj</author>
        <package>com.cerj.bigblu</package>
        <pricing>Paid</pricing>
        <backgroundimage>https://raw.githubusercontent.com/substratum/database/master/images/bigblu.png</backgroundimage>
    </theme>
</substratum>