Simply it gives you greater control over the admin section allowing the colours to match the theme of your website. You can also replace WordPress logos with your very own or just have them blank. It doesn’t stop there, you can also remove unwanted menus and the WordPress upgrade message for non admins.
<ol>
<li>Change the colors of your admin section</li>
<li>Replace WordPress logo in Admin Bar with your own logo</li>
<li>Replace WordPress logo on Login Screen</li>
<li>Remove unwanted menu items for non admins</li>
</ol>

Saner Color and Admin Settings

Change the colors of your dashboard, add your own logo to the head and login sections and hide sections that won't be used.

anmari

This plugin allows one to personalise content for a logged in user. It uses shortcode type functionality in any email template or page or post. It extract stored details of the viewer or reader. A default text can be specified for situations where there are no stored details.
It also allows you to customise the email address that wordpress uses to send the emails, and the sender name. This can allow you to offer a more customised service for example with a more helpful unsubscribe link. Or you could create your own “profile” page for logged in users only.
Plugin homepage: <a href="http://wpusersplugin.com/personalise/" rel="nofollow ugc">http://wpusersplugin.com/personalise/</a> 
Demo page: <a href="http://test.icalevents.com/personalise/" rel="nofollow ugc">http://test.icalevents.com/personalise/</a>

amr personalise

This plugin allows one to personalise pages, posts or wordpress single user emails.

Saner Color and Admin Settings vs amr personalise