“Youtube ToolTip” is a simple plugin, which changes all your links of “youtube” on a fast preview for the convenience of your readers.
Modifying all the links and using “jQuery” shows an attractive & modern blog.
Also use “qTip”, qTip is a tooltip plugin for the jQuery framework. It’s cross-browser, customizable and packed full of features! 
qTip is licensed under the open source MIT license, which allows you to use the script for whatever you want, whenever you want, however you want, as long as you include a copy of the license!
For more information about this plugin visit http://javiergalicia.wordpress.com/2009/07/03/youtube-tooltip-to-wordpress/

Youtube ToolTip

"Youtube ToolTip" Click on any of your links to get a quick preview of the youtube video.

uniquelylost

This plugin will add a widget to your WordPress admin dashboard with selected icons, links, and hover effects. You can add icons and links for quick actions such as adding a new post, page, etc. Or you can add icons and links for external things such as your twitter, facebook, etc.
<h4>Features</h4>
<ul>
<li>Select icons, links, link text.</li>
<li>170+ Dashicons included.</li>
<li>Select icon color, background color, size, and hover effect.</li>
<li>25+ css3 hover effects included.</li>
<li>Select link text color, and size.</li>
<li>Dashboard widget placement options for priority, and side shown.</li>
<li>Dashboard widget viewing permission option, all user roles available.</li>
</ul>

Dashboard Quick Actions

Admin dashboard quick action icons and links for WordPress

Youtube ToolTip vs Dashboard Quick Actions