A method includes: while displaying a wake screen with a first media item as a background and foreground objects displayed over the first media item, detecting first user input that corresponds to a request to display a media gallery; in response to detecting the first user input, ceasing display of the foreground objects; detecting a second user input that corresponds to a request to navigate through media items in the media gallery; in response to detecting the second user input, replacing the first media item with a second media item in the media gallery; detecting a third input that corresponds to a request to dismiss the media gallery; and, in response to detecting the third user input, redisplaying the foreground objects on the display device over a media item from the media gallery that is selected as the background for the wake screen.