Robo

WP-Thumbnail is a simple and neat WordPress Plugin that not only allows you to use a short-code to generate dynamic 
screenshot of webpages in your posts but also takes a realtime snapshot of the served webpage and saves a link to it 
on the page itself that too without burdening the servers. This helps in optimizing search results on Google by adding 
a thumbnail to the left of the search result snippet and makes shared posts more attractive, with a relevant thumbnails, 
on Social Sites like Facebook.
For more information, check out <a href="http://wp-thumbnail.robocasters.com/" rel="nofollow ugc">wp-thumbnail.robocasters.com</a>.
Features include:
<ul>
<li>Short-Code – The plugin has a shortcode that enables you to add dynamic screenshots of webpages to your post.</li>
<li>Meta Thumbnail – It uses meta name thumbnail and adds the live screenshot in it for being displayed as a thumbnail in Google Searches.</li>
<li>PageMaps – PageMaps is a structured data format that provides Google with information about the data on a page. It enables website creators to embed data and notes in webpages.</li>
<li>Facebook OG:Image – It sets image with content og:image to the top priority for being used as a Facebook Post thumbnail.</li>
<li>WP-Thumbnail Class – It adds a WP-Thumbnail class that helps image to be used for all other sharing purposes.</li>
</ul>

WP-Thumbnail

'Changing the way you share', giving you an experience you have never had before...

Pigi

Using this small plugin you’ll be able to change:
<ul>
<li>Wp-admin </li>
<li>Wp-login</li>
<li>register</li>
</ul>
Logo
You need to insert your custom logo URL and Enable the Function
In the “0.5” Version you will also able to change the Default “Wp-admin” Link (to wordpress.org) with your Own Home Page Link, simply 
setting the custom url from the dropdown menu.
Edit Your Wp-login background
You do not need to do any other change.
<ul>
<li>Insert Your Blog’s Review for Free into <a href="http://blogadvice.org/submit-your-blog/" rel="nofollow ugc">BlogAdvice.org</a>; No registration Needed</li>
</ul>

Login Logo Customization

Change Your Wp-Admin, wp-login Logo, Custom Link And BACKGROUND

WP-Thumbnail vs Login Logo Customization