How to indicate that an object is 'active' ie selectable for a touch screen?

Hi, I am designing content for use on a 7" touchscreen tablet. Can anyone suggest a good way of indicating to the learner that an object, eg. an image, is selectable? If our user platform had a cursor I would apply a 'hover' state to the object, but that will not be possible on our touch screens. Got any cunning plans?

Thanks again!

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