.dnd-library-wrapper .editor-item .meta.type-custom {
    background-image: url('icons/before_after_image-gray.png');
}
.scald-menu .add-buttons .add-before_after_image {
    background: url('icons/before_after_image.png') 50% 50% no-repeat;
}
.scald-menu .add-buttons .add-before_after_image:hover {
    background-image: url('icons/before_after_image-blue.png');
}