Hack the flickr-pick-a-picture plugin media button to work like unsplash-wp

pick-a-pic.php

/**
 * Adds the pick a pic icon to the media bar.
 *
 * @param it editor_id.
 * @return noting.
 **/
function pac_pickapic_media_buttons($editor_id = '') {
	echo '<a href="#TB_inline?width=1200&height=800%&inlineId=popup_container"
		class="button thickbox unsplash" title="Flickr - Click photos to upload directly to your media library"
	// id="' . esc_attr( $editor_id ) . '-add_media" title="' . esc_attr__( 'Flickr', 'pickapic' ) . '" onclick="return false;">
	<span class="dashicons dashicons-camera"></span> Flickr</a>';
}
add_action( 'media_buttons', 'pac_pickapic_media_buttons', 20 );