BisonTech

This plugin replace WP default admin/login/register page. 
The technique used is pretty brutal but the best currently possible, the plugin replaces the modified files automatically. 
To make the plugin run the web server must be able to write to the wp-admin directory. 
more info @ http://www.bisontech.net

LogoReplacer

This plugin replace WP default admin/login/register page.

wpgraphicstudio

wpGraphicStudio is a complete membership based affiliate marketing/internet graphic design solution for creating internet marketing graphics in a performant, and easy to use plugin. 
Rather than attempting to provide every feature under the sun, wpGraphicStudio makes graphic creation and generation simple and complete by providing just the features you need.
Features of the plugin include
<ul>
<li>Compatible integration with s2Member</li>
<li>Compatible with both WordPress Standard and Multi Site installs</li>
<li>Integrated video help section</li>
<li>Upload custom images for each module in the members area and graphic gallery sections</li>
<li>Members area</li>
<li>Members graphic galleries</li>
<li>Members can save, download, delete their created graphics</li>
<li>Email created graphics</li>
<li>No limits or restrictions on the use of designed graphics</li>
<li>Admin control over number of modules displayed in the create graphic and graphic gallery areas</li>
<li>5 included graphic modules to get you started
<ul>
<li>Belcher Boxes</li>
<li>Call to Actions</li>
<li>Buttons</li>
<li>Web Boxes</li>
<li>Headlines</li>
</ul>
</li>
<li>Modular with many additional module <a href="http://wpgraphicstudio.com" rel="nofollow ugc">add-ons</a> to choose from.</li>
</ul>
Build Up Your Email Subscribers
Use wpGraphicStudio as a free graphic service on your website as well 
as a paid service and wpGraphicStudio can easily grow your email 
subscription lists while making you money at the same time.
More information at <a href="http://wpgraphicstudio.com" rel="nofollow ugc">wpGraphicStudio</a>

wpGraphicStudio

Create and generate affiliate and internet marketing graphics for your use or start a complete affiliate, internet marketing graphics membership site.

LogoReplacer vs wpGraphicStudio