Increase familiarity with the art of photography.
Invite someone to teach the youth in each ward or branch the basic principles of photography, such as composition, lighting, and so on. Assign each ward a topic (or topics), and have them take photos that fit their topics in preparation for a stake event where they will be displayed.
Consider awarding prizes in a variety of categories. This activity could be adapted to focus on a gospel theme. Examples could include the youth theme for the year, a topic in For the Strength of Youth, a scriptural theme, and so on.