Unfortunately, "Rotate questions" only works with questions.
That is not exatly true. Create thrww "texts" with the HTML code to display an image (each), and use their IDs - done.
That, however, is not as elegant as one might wish. It would be more elegant to draw 3 codes from a random generator with the three images as content, and than do this:
// Draw from the random generator
show('RG01');
// Read the three image names
$images = valueList('RG01', NULL, 'label');
// Show them
foreach ($images as $image) {
html('<div><img src="'.$image.'" alt=""></div>');
}