Create a treasure hunt, where either students find clues and send images from their phones when they find them, or add parts to the puzzle, thinking orientation tasks, learning games... find specific parts in the room.... the options are endless

Capture board discussions before erasing them, so you can recap, or fill in students who have missed sections

As an introduction to a piece of equipment... a task to discuss what it is... label... discuss OHS issues related to it.

Some ways to use your camera phone in the class room - apart from taking and making calls....
Using student work to showcase what you are after....good examples... (always ask permission first if posting to an open site... thanks Opal :))