Create a dynamically populated radio field. For choices return an array
// build list of images to allow
// $images contains a list of image IDs
foreach ($images as $image_id) {
$image = wp_get_attachment_image_src($image_id, $size);
$image_tag = '<img src="'.$image[0].'"' width="'.$image[1].'" height="'.$image[2].'"';
$choices[$image_id] = $image_tag;
}
return $choices
for more information see http://www.advancedcustomfields.com/resources/dynamically-populate-a-select-fields-choices/ this can also be done with radio or checkbox fields.
