Abstract: A method and system for modifying, based on a theme, a look and feel of a graphical user interface (GUI) generated for a first application without comparably modifying a look and feel of a GUI generated for another application. The GUIs for both the first and second applications include corresponding components that are customizable. The components include icons, fonts, colors, images, sounds, and so forth. The system displays a theming overlay over the first application. The system receives an instruction from a user via the theming overlay to apply a theme to the first application. The system applies the theme to the first application and not the second application. Accordingly, a GUI element of the theme is applied to the customizable component of the first application but not the customizable component of the second application.