So, we decided that we couldn't wait and made a couple of Viddler icons ourselves. It actually didn't take too long! That said, we only made the Default and Inside designs, but still!
Anyway, you can check out what we did at http://www.lazyreviewzzz.com, in our sidebar (on the right), under our Twitter Feed.
Once we made the images, inserting the code was the easy part. We just copied the YouTube code portion (below) and inserted the word viddler or Viddler in place of youtube or Youtube!
'youtube' => array(
'title' => __('YouTube URL', 'spw'),
'img' => sprintf( '%s/Youtube_%s.png', $this->plugins_imgs_url . esc_attr( $instance['icon_set'] ), esc_attr( $instance['size'] ) ),
'img_widget' => sprintf( '%s/Youtube_%s.png', $this->plugins_imgs_url . esc_attr( $instance['icon_set'] ), '48x48' ),
'img_title' => __('Youtube', 'spw')
If you want to make an email icon, find a picture of an email icon you like, copy one of the icon images to use as a template and make a new email icon in that design, then upload it into the appropriate design folder within the plugin's image folder.
Then copy the code above into the plugin editor and replace the words Youtube with Email. As far as the mailto code goes though, that's up to you to figure out.