Each theme you purchase comes with a custom app icon. This allows you to set an alternate icon for Sofa.
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Previewing themes is a great way to give a theme a little test drive before committing to buying it. All you have to do is navigate to a theme you're interested in and tap the "Preview" button. This will give you a full preview of a theme for 30 seconds.
To apply themes you must first purchase them. Sofa does come with three free themes, which can be found in "My Themes".