Users with the full version of Adobe Spark (as opposed to users on the Starter Plan) can use Spark’s Brand Management capabilities to create unique themes designed specifically for their own brand.
If you are using the full version of Spark and you would like to create a new theme, first set up your brand by clicking "Personalize this design" at the top left of the "Your Projects" page. If your brand is already set up, click "Manage Brand". From there, scroll to the "Themes" section. We automatically generate you three Spark Video and three Spark Page themes, but you can create your own by clicking the "+" button. Once in the theme editor, you can customize colors and fonts.